chore: import upstream snapshot with attribution

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: 'C-bug'
+assignees: ''
+
+---
+
+## Lapce Version
+
+The Lapce version you are using, which can be found in "About Lapce" at the top right settings icon. 
+
+## System information
+
+the operating system used, including its version, e.g. Windows 10, Ubuntu 18.04
+
+## Describe the bug
+A clear and concise description of what the bug is.
+
+## Additional information
+
+Other information that can be used to further reproduce or isolate the problem.
+This commonly includes:
+
+- screenshots
+- logs
+- theories about what might be going wrong
+- workarounds that you used

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: false
+contact_links:
+  - name: Lapce community on Discord
+    url: https://discord.gg/n8tGJ6Rn6D
+    about: Please ask and answer questions here.
+  - name: Lapce community on Matrix
+    url: https://matrix.to/#/#lapce-editor:matrix.org
+    about: Please ask and answer questions here.
+  - name: Lapce documentation
+    url: https://docs.lapce.dev/
+    about: Documentation for Lapce

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+title: ''
+labels: 'C-feature'
+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.