Add changelog

CHANGELOG.md

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+# Changelog
+
+## [Unreleased]
+
+### Added
+- Support for cheats with Pico Loader API v3
+- Hide files/dirs with hidden attribute, or with a name starting with a period
+- New customization options for custom themes
+    - Position of elements on the top screen
+    - Text colors
+    - Blend colors
+
+### Changed
+- File name on the top screen now uses marquee when too long
+
+### Fixed
+- Improve error handling for banners to better detect if a rom has a valid banner
+
+## [v1.1.0] - 11 Jan 2026
+
+### Added
+- Support for Pico Loader API v2. This makes it possible to return to Pico Launcher from supported homebrew applications.
+
+## [v1.0.0] - 25 Nov 2025
+- Initial release