f-droid: add metadata folder (#134)

* add fastlane metadata for f-droid and gplay

* remove google signing block

Needed to be removed for F-Droid.
See https://gitlab.com/fdroid/admin/-/issues/367

fastlane/metadata/android/en-US/changelog/3.txt

@@ -0,0 +1,24 @@
+### Added
+- Location services check during app startup with educational UI
+- Message text selection functionality in chat interface
+- Enhanced RSSI tracking and unread message indicators
+- Major Bluetooth connection architecture refactoring with dedicated managers
+
+### Fixed
+- **Critical**: Android-iOS message fragmentation compatibility issues
+  - Fixed fragment size (500→150 bytes) and ID generation for cross-platform messaging
+  - Ensures Android can properly communicate with iOS devices
+- DirectMessage notifications and text copying functionality
+- Smart routing optimizations (no relay loops, targeted delivery)
+- Build system compilation issues and null pointer exceptions
+
+### Changed
+- Comprehensive dependency updates (AGP 8.10.1, Kotlin 2.2.0, Compose 2025.06.01)
+- Optimized BLE scan intervals for better battery performance
+- Reduced excessive logging output
+
+### Improved
+- Cross-platform compatibility with iOS and Rust implementations
+- Connection stability through architectural improvements
+- Battery performance via scan duty cycling
+- User onboarding with location services education