doc: add changelog

CHANGELOG.md

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+## 1.1.1 - 2024-01-16
+
+### Added
+- This changelog
+
+### Fixed
+- An error occured if a duplicate is found in the search results or episodes list
+- Offline downloaded episode was shown as played and ended
+
+## 1.1.0 - 2024-01-15
+
+### Added
+- Show episode filesize on download description button
+- Horizontal scrollbars on hot and new podcasts
+
+### Changed
+- Use moment instead of date-fns to have localized publication dates
+
+### Fixed
+- Missing title on description modal
+- Display a generic avatar if author is missing
+- Handle feed's redirections
+- Sort search results and episodes by publication date
+
+## 1.0.0 - 2024-01-11
+
+- Initial release