add templates for issues and PRs (#3)

resolve #2

.github/ISSUE_TEMPLATE/bug-report.md

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+---
+name: Bug report
+title: 'BUG: '
+about: Help us improve
+labels: 'bug'
+assignees: ''
+---
+
+### What version of the package are you using?
+
+
+### Does this issue reproduce with the latest release?
+
+
+### What OS and CPU architecture are you using (`go env`)?
+
+
+### What did you do?
+
+<!--
+If possible, provide steps and/or code to reproduce the problem
+-->
+
+### What did you expect to see?
+
+
+### What did you see instead?

.github/ISSUE_TEMPLATE/config.yml

@@ -0,0 +1,5 @@
+blank_issues_enabled: false
+contact_links:
+  - name: Veraison Zulip streams
+    url: https://invalid.example
+    about: Please ask and answer questions here.

.github/ISSUE_TEMPLATE/docs-issue.md

@@ -0,0 +1,10 @@
+---
+name: Docs issue
+title: 'DOCS: '
+about: Report an issue regarding documentation
+labels: 'documentation'
+assignees: ''
+
+---
+
+### Please describe the problem

.github/ISSUE_TEMPLATE/feature-request.md

@@ -0,0 +1,23 @@
+---
+name: "\U0001F4A1 Feature request"
+about: Suggest an idea for this project
+title: 'feature: '
+labels: 'enhancement'
+assignees: ''
+---
+
+### Is your feature request related to a problem? Please describe
+
+A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
+
+### If possible, describe a solution
+
+A clear and concise description of what you want to happen.
+
+### Describe alternatives you have considered
+
+A clear and concise description of any alternative solutions or features you've considered.
+
+## Additional context
+
+Add any other context or screenshots about the feature request here.

.github/PULL_REQUEST_TEMPLATE/pull_request_template.md

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+### Description
+<!--
+Please explain the changes you made here.
+
+Add a reference to a related issue in the repository.
+
+@mentions of the person or team responsible for reviewing proposed changes.
+-->
+
+### Checklist
+- [ ] Code compiles correctly
+- [ ] Created tests which fail without the change (if possible)
+- [ ] All tests passing
+- [ ] Extended the README / documentation, if necessary