Add issue templates

Author: alexet

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**To Reproduce**
+Steps to reproduce the behavior.
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Additional context**
+Add any other context about the problem here.

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+title: ''
+labels: ''
+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 [...]
+
+**Describe the solution you'd like**
+A clear and concise description of what you want to happen.
+
+**Describe alternatives you've 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/ISSUE_TEMPLATE/new-extension-release.md

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+---
+name: New extension release
+about: Create an issue with a checklist for the release steps (write access required
+  for the steps)
+title: Release Checklist for version xx.xx.xx
+labels: ''
+assignees: ''
+
+---
+
+- [ ] Trigger a release build on Actions by adding a new tag on master of the format `vxx.xx.xx`
+- [ ] Monitor the status of the release build in the `Release` workflow in the Actions tab.
+- [ ] Download the VSIX from the draft GitHub release that is created when the release build finishes.
+- [ ] Log into the [Visual Studio Marketplace](https://marketplace.visualstudio.com/manage/publishers/github).
+- [ ] Click the `...` menu in the CodeQL row and click **Update**.
+- [ ] Drag the `.vsix` file you downloaded from the GitHub release into the Marketplace and click **Upload**.
+- [ ] Publish the GitHub release.