Add issue and PR templates

.gitea/PULL_REQUEST_TEMPLATE.md

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+<!-- .gitea/PULL_REQUEST_TEMPLATE.md -->
+## Description
+
+Brief description of what this PR does.
+
+## Type of Change
+
+- [ ] 🐛 Bug fix (non-breaking change which fixes an issue)
+- [ ] ✨ New feature (non-breaking change which adds functionality)  
+- [ ] 💥 Breaking change (fix or feature that would cause existing functionality to not work as expected)
+- [ ] 📚 Documentation update
+- [ ] 🔧 Configuration change
+
+## Testing
+
+- [ ] I have tested this on macOS
+- [ ] I have tested this on Linux
+- [ ] I have tested this with Fish shell
+- [ ] I have tested this with Zsh shell
+
+## Checklist
+
+- [ ] My code follows the style guidelines of this project
+- [ ] I have performed a self-review of my own code
+- [ ] I have made corresponding changes to the documentation
+- [ ] My changes generate no new warnings
+- [ ] I have tested that the installation script still works