feat: add document templates library with 10 templates

src/templates/release-notes.md

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+# Release Notes - v1.0.0
+
+**Release Date:** {{DATE}}
+
+## Highlights
+
+Brief summary of the most important changes in this release.
+
+## New Features
+
+- **Feature 1:** Description of the new feature
+- **Feature 2:** Description of the new feature
+
+## Improvements
+
+- Improved performance of feature X
+- Updated dependency Y to version Z
+
+## Bug Fixes
+
+- Fixed issue where X would cause Y (#123)
+- Resolved crash when performing Z (#456)
+
+## Breaking Changes
+
+- Changed API endpoint from `/old` to `/new`
+- Removed deprecated method `oldMethod()`
+
+## Migration Guide
+
+### From v0.9.x to v1.0.0
+
+1. Update configuration file format
+2. Replace deprecated API calls
+
+## Known Issues
+
+- Issue description (#789)
+
+## Contributors
+
+Thanks to everyone who contributed to this release.