add issue templates to repository (#258)

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: "\U0001F41B Bug report"
+about: Create a report to help us repair something that is currently broken
+labels: bug, status:Needs Triage
+---
+
+<!-- Welcome! Thank you for contributing. These HTML comments will not render in the issue, but you can delete them once you've read them if you prefer! -->
+
+<!--
+Right now, you're opening an issue to report a bug in Jupyter NbClassic.
+
+Please answer the following questions for yourself before submitting an issue
+- [ ] I checked the documentation and found no answer
+- [ ] I checked to make sure that this issue has not already been filed
+- [ ] I'm reporting the issue to the correct repository
+
+
+NOTE:
+Here, we're looking for specific bugs in the Jupyter NbClassic codebase. If you think you've identified such a bug, you can continue opening your issue here. We'd appreciate if you include as much detail as possible, such as links to the offending code, snapshots of the UI issue, code blocks with your console logs, etc.
+-->
+
+## Description
+
+<!--Describe the bug clearly and concisely. Include screenshots if possible-->
+
+## Reproduce
+
+<!--Describe step-by-step instructions to reproduce the behavior-->
+
+1. Go to '...'
+2. Click on '...'
+3. Scroll down to '...'
+4. See error '...'
+
+<!--Describe how you diagnosed the issue. See the guidelines at
+https://nbclassic.readthedocs.io/en/latest/troubleshooting.html -->
+
+## Expected behavior
+
+<!--Describe what you expected to happen-->
+
+## Context
+
+<!--Complete the following for context, and add any other relevant context-->
+
+- Operating System and version: <!-- e.g. Linux Ubuntu 21.04 -->
+- Browser and version: <!-- e.g. Chrome 92 -->
+<!-- Please note the NbClassic version you are working with. You can find this in the Help -> About Jupyter NbClassic menu option  -->
+- Jupyter NbClassic version: <!-- e.g. 3.1.7 -->
+
+<!--The more content you provide, the more we can help!-->
+
+<details><summary>Troubleshoot Output</summary>
+<pre>
+Paste the output from running `jupyter troubleshoot` from the command line here.
+You may want to sanitize the paths in the output.
+</pre>
+</details>
+
+<details><summary>Command Line Output</summary>
+<pre>
+Paste the output from your command line running `jupyter nbclassic` here, use `--debug` if possible.
+</pre>
+</details>
+
+<details><summary>Browser Output</summary>
+<!--See https://webmasters.stackexchange.com/a/77337 for how to access the JavaScript console-->
+<pre>
+Paste the output from your browser Javascript console here, if applicable.
+
+</pre>
+</details>

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: false
+contact_links:
+  - name: Is this a common issue? See our Docs.
+    url: https://nbclassic.readthedocs.io/en/latest/troubleshooting.html#what-to-do-when-things-go-wrong
+    about: Before opening an issue, make sure your issue hasn't already been addressed in the documentation.

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: "\U0001F680 Feature Request"
+about: Suggest a new feature or a change
+labels: enhancement, status:Needs Triage
+---
+
+<!-- Welcome! These HTML comments will not render in the issue, but you can delete them once you've read them if you prefer! -->
+
+<!--
+Thanks for thinking of a way to improve Jupyter NbClassic. If this solves a problem for you, then it probably solves that problem for lots of people! So the whole community will benefit from this request.
+
+Finally, please answer the following questions for yourself before submitting an issue.
+
+- [ ] I checked to make sure that this issue has not already been filed
+- [ ] I'm reporting the issue to the correct repository
+
+-->
+
+### Problem
+
+<!-- Provide a clear and concise description of what problem this feature will solve. For example:
+
+* I'm always frustrated when [...] because [...]
+* I would like it if [...] happened when I [...] because [...]
+-->
+
+### Proposed Solution
+
+<!-- Provide a clear and concise description of a way to accomplish what you want. For example:
+
+* Add an option so that when [...]  [...] will happen
+ -->
+
+### Additional context
+
+<!-- Add any other context or screenshots about the feature request here. You can also include links to examples of other programs that have something similar to your request. For example:
+
+* Another project [...] solved this by [...]
+-->