Add GitHub templates

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: 'Bug report'
+about: 'Create a bug report to help us improve'
+title: ''
+labels: [ 'bug' ]
+assignees: ''
+---
+
+**Bug description**
+<!-- A clear and concise description of what the bug is. Describe the expected bahavior
+  and how it is currently different. If you are unsure if it is a bug, consider discussing
+  it on our Discord server first. -->
+
+**To Reproduce**
+<!-- Steps to reproduce the behavior. -->
+
+**Context info**
+<!-- Please add relevant information about your system. For example:
+- Version of headscale used
+- Version of tailscale client
+- OS (e.g. Linux, Mac, Cygwin, WSL, etc.) and version
+- Kernel version
+- The relevant config parameters you used
+- Log output
+-->

.github/ISSUE_TEMPLATE/config.yml

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+# Issues must have some content
+blank_issues_enabled: false
+
+# Contact links
+contact_links:
+  - name: "headsacle usage documentation"
+    url: "https://github.com/juanfont/headscale/blob/main/docs"
+    about: "Find documentation about how to configure and run headscale."
+  - name: "headscale Discord community"
+    url: "https://discord.com/invite/XcQxk2VHjx"
+    about: "Please ask and answer questions about usage of headscale here."

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: 'Feature request'
+about: 'Suggest an idea for headscale'
+title: ''
+labels: [ 'enhancement' ]
+assignees: ''
+---
+
+**Feature request**
+<!-- A clear and precise description of what new or changed feature you want. -->
+
+<!-- Please include the reason, why you would need the feature. E.g. what problem
+  does it solve? Or which workflow is currently frustrating and will be improved by
+  this? -->

.github/ISSUE_TEMPLATE/other_issue.md

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+---
+name: 'Other issue'
+about: 'Report a different issue'
+title: ''
+labels: [ 'bug' ]
+assignees: ''
+---
+
+<!-- If you have a question, please consider using our Discord for asking questions -->
+
+**Issue description**
+<!-- Please add your issue description. -->
+
+**To Reproduce**
+<!-- Steps to reproduce the behavior. -->
+
+**Context info**
+<!-- Please add relevant information about your system. For example:
+- Version of headscale used
+- Version of tailscale client
+- OS (e.g. Linux, Mac, Cygwin, WSL, etc.) and version
+- Kernel version
+- The relevant config parameters you used
+- Log output
+-->

.github/pull_request_template.md

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+<!-- Please tick if the following things apply. You… -->
+
+- [] read the [CONTRIBUTING guidelines](README.md#user-content-contributing)
+- [] raised a GitHub issue or discussed it on the projects chat beforehand
+- [] added unit tests
+- [] added integration tests
+- [] updated documentation if needed
+- [] updated CHANGELOG.md
+
+<!-- If applicable, please reference the issue using `Fixes #XXX` and add tests to cover your new code. -->