chore: Add changelog and issue templates

- CHANGELOG.md: Keep a Changelog format, semantic versioning
- Issue templates: bug report, feature request, MVP task
- Ready for issue tracking on Gitea

.gitea/ISSUE_TEMPLATE/mvp_task.md

@@ -0,0 +1,32 @@
+---
+name: MVP Task
+about: Task for the MVP (v0.1) release
+labels: mvp, enhancement
+---
+
+## Task Description
+Brief description of what needs to be done.
+
+## Acceptance Criteria
+- [ ] Criterion 1
+- [ ] Criterion 2
+- [ ] Criterion 3
+
+## Technical Details
+- **Related files/components:**
+- **Database changes:** (if any)
+- **Dependencies:** (other issues that must be completed first)
+
+## Resources
+- Link to relevant documentation
+- Design mockups (if applicable)
+- API references
+
+## Testing
+How should this be tested?
+
+## Estimated Effort
+(e.g., 1 day, 3 days, 1 week)
+
+## Notes
+Any additional context or considerations.