chore: add repo meta files (LICENSE, README, CHANGELOG, gitignore)

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

.gitignore

@@ -0,0 +1,57 @@
+# Built application files
+*.apk
+*.aar
+*.ap_
+*.aab
+
+# Files for the ART/Dalvik VM
+*.dex
+
+# Java class files
+*.class
+
+# Generated files
+bin/
+gen/
+out/
+release/
+
+# Gradle files
+.gradle/
+build/
+
+# Local configuration file (sdk path, etc)
+local.properties
+
+# Proguard folder generated by Eclipse
+proguard/
+
+# Log files
+*.log
+
+# Android Studio / IntelliJ
+*.iml
+.idea/
+.navigation/
+captures/
+.externalNativeBuild/
+.cxx/
+
+# Keystore files
+*.jks
+*.keystore
+/key.properties
+
+# Google Services (e.g. APIs or Firebase)
+google-services.json
+
+# OS files
+.DS_Store
+Thumbs.db
+
+# F-Droid local artifacts (the pipeline generates them in CI)
+fdroid/repo/
+fdroid/keystore.p12
+
+# KSP
+.ksp/