Initial commit: GitHub Release Monitor CLI tool

CLI tool that tracks GitHub releases or tags from user-defined repositories
and exposes them as a subscribable RSS 2.0 feed.

Features:
- Track releases or tags per repository
- SQLite storage with automatic deduplication
- RSS 2.0 feed with markdown-stripped release notes
- Built-in HTTP server for local feed access
- Rate-limit-aware GitHub API client
- 64 passing tests

.gitignore

@@ -0,0 +1,16 @@
+__pycache__/
+*.py[cod]
+*.so
+*.egg-info/
+dist/
+build/
+.eggs/
+*.egg
+.pytest_cache/
+.mypy_cache/
+.coverage
+htmlcov/
+*.db
+.env
+venv/
+.venv/