Implement issue templates

.github/ISSUE_TEMPLATE/10_package_loading.yml

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+name: Package does not load successfully
+description: "`library(qgisprocess)` gives an error and I am stuck."
+labels: [null]
+body:
+  - type: markdown
+    attributes:
+      value: >
+        Thanks for taking the time to fill out this bug report!
+        [Styling with Markdown](https://docs.github.com/github/writing-on-github/getting-started-with-writing-and-formatting-on-github/basic-writing-and-formatting-syntax) is supported.
+  - type: checkboxes
+    id: checks
+    attributes:
+      label: Things to check beforehand
+      description: >
+        Please consider the following tips carefully.
+        They may already solve your problem.
+      options:
+        - label: To avoid duplication, I have checked [existing issues](https://github.com/r-spatial/qgisprocess/issues?q=is%3Aissue).
+        - label: I use a currently supported QGIS version, i.e. shown _**green**_ in the [QGIS release schedule](https://www.qgis.org/en/site/getinvolved/development/roadmap.html#release-schedule).
+  - type: dropdown
+    id: plugins
+    attributes:
+      label: Are QGIS plugins the cause?
+      description: Does the R package load successfully after **disabling** all QGIS plugins in QGIS Desktop and restarting R? (_Plugins > Manage and Install Plugins..._)
+      options:
+        - -- choose --
+        - The R package loads successfully after disabling all QGIS plugins.
+        - The problem remains with all plugins disabled.
+      default: 0
+    validations:
+      required: false
+  - type: markdown
+    attributes:
+      value: >
+        If indeed plugins are at play, please try to narrow down the cause by
+        enabling plugins one by one, each time restarting R and loading
+        {qgisprocess}, and report back below about which plugin(s) causes the
+        issue.
+  - type: textarea
+    id: report
+    attributes:
+      label: Description of the observed problem
+      description: >
+        Please also include complete R code and output.
+        Put code blocks between triple backtick (\`\`\`) lines.
+    validations:
+      required: true
+  - type: input
+    id: version
+    attributes:
+      label: QGIS version
+      description: What version of QGIS are you running?
+      placeholder: e.g. 3.28.1
+    validations:
+      required: true
+  - type: textarea
+    id: sessioninfo
+    attributes:
+      label: R session info
+      description: >
+        Please provide the output of `sessionInfo()` or (preferably)
+        `sessioninfo::session_info()`.
+        Put this code block between triple backtick (\`\`\`) lines.
+    validations:
+      required: true
+  - type: textarea
+    id: context
+    attributes:
+      label: Additional context
+      description: Any other information you deem relevant, e.g. the way you have installed QGIS, or things that you tried already.
+    validations:
+      required: false
+

.github/ISSUE_TEMPLATE/20_plugin.yml

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+name: Processing provider or QGIS plugin problem in R
+description: "Unexpected behaviour from `qgis_plugins(query = TRUE)` or when running a plugin-provided algorithm."
+labels: [null]
+body:
+  - type: markdown
+    attributes:
+      value: >
+        Thanks for taking the time to fill out this bug report!
+        [Styling with Markdown](https://docs.github.com/github/writing-on-github/getting-started-with-writing-and-formatting-on-github/basic-writing-and-formatting-syntax) is supported.
+  - type: markdown
+    attributes:
+      value: |
+        #### Important note
+
+        If you encounter an issue with a specific QGIS plugin in R, then **please** check whether the problem also exists in the QGIS Desktop (GUI).
+        If that is the case, then you should _not_ report the problem here, but at the plugin's bug tracking URL (issues) that you should lookup at <https://plugins.qgis.org/>. There you should formulate the problem as you encounter it in QGIS Desktop (not R).
+
+        If the plugin _only_ misbehaves in R, and not in QGIS Desktop, then please proceed below!
+  - type: checkboxes
+    id: checks
+    attributes:
+      label: Checks and questions
+      description: >
+        Please consider the following information carefully.
+        Some may already solve your problem, or will provide us hints to help you.
+      options:
+        - label: To avoid duplication, I have checked [existing open issues](https://github.com/r-spatial/qgisprocess/issues).
+        - label: I use a currently supported QGIS version, i.e. shown _**green**_ in the [QGIS release schedule](https://www.qgis.org/en/site/getinvolved/development/roadmap.html#release-schedule).
+        - label: In QGIS Desktop, I have updated all QGIS plugins to their current version (_Plugins > Manage and Install Plugins..._).
+        - label: I get a standard error message from `qgis_plugins(query = TRUE)`.
+  - type: dropdown
+    id: disabling
+    attributes:
+      label: Does disabling the problematic plugin(s) makes the warning or error disappear?
+      description: If "no", then consider reporting your problem in [the general issue template](https://github.com/r-spatial/qgisprocess/issues/new?template=30_other.yml) as it appears not to be linked to a plugin.
+      options:
+        - -- choose --
+        - Yes.
+        - No.
+        - "Not applicable: the problem only arises when using algorithms provided by the plugin."
+      default: 0
+    validations:
+      required: false
+  - type: textarea
+    id: report
+    attributes:
+      label: Description of the observed problem
+      description: >
+        Please also include complete R code and output.
+        Put code blocks between triple backtick (\`\`\`) lines.
+    validations:
+      required: true
+  - type: textarea
+    id: version
+    attributes:
+      label: Backend versions
+      description: >
+        Please provide the output of `qgis_version(query = TRUE, debug = TRUE)`.
+        Put this code block between triple backtick (\`\`\`) lines.
+    validations:
+      required: true
+  - type: textarea
+    id: plugins
+    attributes:
+      label: QGIS plugin state
+      description: >
+        Please provide the output of `qgis_plugins(query = TRUE)`.
+        Put this code block between triple backtick (\`\`\`) lines.
+    validations:
+      required: true
+  - type: textarea
+    id: sessioninfo
+    attributes:
+      label: R session info
+      description: >
+        Please provide the output of `sessionInfo()` or (preferably)
+        `sessioninfo::session_info()`.
+        Put this code block between triple backtick (\`\`\`) lines.
+    validations:
+      required: true
+  - type: textarea
+    id: context
+    attributes:
+      label: Additional context
+      description: Any other information you deem relevant, e.g. the way you have installed QGIS, or things that you tried already.
+    validations:
+      required: false
+

.github/ISSUE_TEMPLATE/30_other.yml

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+name: Report another problem with R-package {qgisprocess}
+description: "Report other unexpected behaviour here."
+labels: [null]
+body:
+  - type: markdown
+    attributes:
+      value: >
+        Thanks for taking the time to fill out this bug report!
+        [Styling with Markdown](https://docs.github.com/github/writing-on-github/getting-started-with-writing-and-formatting-on-github/basic-writing-and-formatting-syntax) is supported.
+  - type: checkboxes
+    id: checks
+    attributes:
+      label: Things to check beforehand
+      description: >
+        Please consider the following tips carefully.
+        They may already solve your problem.
+      options:
+        - label: To avoid duplication, I have checked [existing issues](https://github.com/r-spatial/qgisprocess/issues?q=is%3Aissue).
+        - label: I use a currently supported QGIS version, i.e. shown _**green**_ in the [QGIS release schedule](https://www.qgis.org/en/site/getinvolved/development/roadmap.html#release-schedule).
+  - type: dropdown
+    id: plugins
+    attributes:
+      label: Are QGIS plugins the cause?
+      description: Does your code run successfully after **disabling** all QGIS plugins in QGIS Desktop and restarting R? (_Plugins > Manage and Install Plugins..._)
+      options:
+        - -- choose --
+        - The code runs successfully after disabling all QGIS plugins.
+        - The problem remains with all plugins disabled.
+      default: 0
+    validations:
+      required: false
+  - type: markdown
+    attributes:
+      value: >
+        If indeed plugins are at play, please try to narrow down the cause by
+        enabling plugins one by one, each time restarting R and rerunning your
+        code, and report back below about which plugin(s) causes the
+        issue.
+  - type: textarea
+    id: report
+    attributes:
+      label: Description of the observed problem
+    validations:
+      required: true
+  - type: textarea
+    id: reprex
+    attributes:
+      label: Minimal reproducible example
+      description: >
+        Please provide a minimal reproducible example (MRE).
+        An MRE demonstrates where the problem lies and often helps to solve it.
+        Please read what constitutes an MRE
+        [at Stack Overflow](https://stackoverflow.com/help/minimal-reproducible-example).
+        Put the code block between triple backtick (\`\`\`) lines.
+        The easiest is to copy R code in your clipboard, run
+        `reprex::reprex(session_info = TRUE)` (it updates your clipboard) and
+        paste your clipboard below.
+    validations:
+      required: false
+  - type: textarea
+    id: version
+    attributes:
+      label: Backend versions
+      description: >
+        Please provide the output of `qgis_version(query = TRUE, debug = TRUE)`.
+        Put this code block between triple backtick (\`\`\`) lines.
+    validations:
+      required: true
+  - type: textarea
+    id: plugins2
+    attributes:
+      label: QGIS plugin state
+      description: >
+        Please provide the output of `qgis_plugins(query = TRUE)`.
+        Put this code block between triple backtick (\`\`\`) lines.
+    validations:
+      required: true
+  - type: textarea
+    id: sessioninfo
+    attributes:
+      label: R session info
+      description: >
+        Please provide the output of `sessionInfo()` or (preferably)
+        `sessioninfo::session_info()`.
+        Put this code block between triple backtick (\`\`\`) lines.
+    validations:
+      required: true
+  - type: textarea
+    id: context
+    attributes:
+      label: Additional context
+      description: Any other information you deem relevant, e.g. the way you have installed QGIS, or things that you tried already.
+    validations:
+      required: false
+

.github/ISSUE_TEMPLATE/40_feature.yml

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+name: Feature request
+description: "Suggest an idea for a new feature."
+labels: [null]
+body:
+  - type: markdown
+    attributes:
+      value: >
+        [Styling with Markdown](https://docs.github.com/github/writing-on-github/getting-started-with-writing-and-formatting-on-github/basic-writing-and-formatting-syntax) is supported.
+  - type: textarea
+    id: request
+    attributes:
+      label: Description of the requested feature
+    validations:
+      required: true
+  - type: textarea
+    id: context
+    attributes:
+      label: Additional context
+    validations:
+      required: false

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: false
+contact_links:
+  - name: Need help with setup of QGIS plugins?
+    url: https://docs.qgis.org/latest/en/docs/user_manual/plugins/plugins.html
+    about: You first need to setup QGIS plugins outside of R, in order to access them from R.
+  - name: Need help with setup of external processing providers?
+    url: https://docs.qgis.org/latest/en/docs/user_manual/processing/3rdParty.html
+    about: You first need to setup external processing providers outside of R, in order to use them from R.
+  - name: Looking for the QGIS documentation?
+    url: https://qgis.org/en/docs/index.html
+    about: Learn about the QGIS processing framework, the QGIS GUI and more.
+  - name: Need further QGIS support?
+    url: https://qgis.org/en/site/forusers/support.html
+    about: For all QGIS questions or problems unrelated to the R-package {qgisprocess}.
+  - name: Question about using R-package {qgisprocess}?
+    url: https://gis.stackexchange.com/search?tab=newest&q=qgisprocess
+    about: >
+      Questions about using {qgisprocess} should not be posted in the GitHub
+      repo, but in a support forum like https://gis.stackexchange.com or
+      https://stackoverflow.com.
+      GitHub issues are for bug reports and suggestions for new features.