Adds license and initial changelog

### Added
- Adds an unlicensed public-domain license to permit unrestricted use.
- Adds an initial versioned changelog entry for v0.1.0.
- Adds a project avatar to the landing page to strengthen branding.
- Adds a rule to ignore macOS metadata files.
- Add assets

.gitignore

@@ -5,3 +5,4 @@ __pycache__/
 *.pyo
 *.pyd
 data/dashboard.db
+.DS_Store