First suggestion for issue and pr templates. (#289)

* First suggestion for issue and pr templates.
Signed-off-by: Fabian Kammel <fk@edgeless.systems>

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+### Issue description
+<!-- A clear and concise description of what the issue is -->
+
+
+### To reproduce
+Steps to reproduce the behavior:
+
+1.
+2.
+3.
+
+
+### Environment
+
+- `constellation version`:
+- `constellation-conf.yaml`
+  - (make sure to remove sensitive information, e.g., `yq e 'del(.provider.*.project)' constellation-conf.yaml`)
+- VM type used to run Constellation.
+
+### Expected behavior
+<!-- A clear and concise description of what you expected to happen -->
+
+### Additional info / screenshot
+<!-- Any additional information or context -->

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: true
+contact_links:
+  - name: Constellation Discussions
+    url: https://github.com/edgelesssys/constellation/discussions
+    about: Ask and answer questions about Constellation.
+  - name: Confidential Computing Discord
+    url: https://discord.com/invite/rH8QTH56JN
+    about: Join the Confidential Computing community!

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+### Use case
+<!-- A clear and concise description of what the problem is. -->
+
+### Describe your solution
+<!-- A clear and concise description of what you want to happen. -->
+
+### Additional context
+<!-- Add any other context or screenshots about the feature request here. -->

.github/pull_request_template.md

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+<!--
+Thank you for your contribution!
+
+For more information check our contributors guide CONTRIBUTING.md (link below text box).
+
+NOTE: This template is a guideline to help you to provide meaningful information for reviewers.
+Feel free to edit, complete or extend this list while the PR is open.
+-->
+
+### Proposed change(s)
+<!-- Please provide a description of the change(s) here. -->
+-
+-
+
+<!-- (uncomment if applicable)
+### Related issue
+- link to the issue
+-->
+
+<!-- (uncomment if applicable)
+### Additional info
+- Any additional information or context
+-->
+
+### Checklist
+<!-- Remove items that do not apply. For completed items, change [ ] to [x], or check after submitting. -->
+
+- [ ] Update [CHANGELOG.md](/CHANGELOG.md)
+- [ ] Update [constellation-docs](https://github.com/edgelesssys/constellation-docs)
+    - [ ] Link PR in docs
+- [ ] Link to Milestone