chore: add repository gitignore

.gitignore

@@ -0,0 +1,36 @@
+# Signing / secrets
+*.jks
+*.keystore
+local.properties
+release-signing.env
+release-signing.env.*
+*.properties.local
+.env
+.env.*
+
+# Gradle / Android build output
+.gradle/
+build/
+app/build/
+dist/
+*.apk
+*.aab
+*.apks
+
+# Rust / native build output
+native/**/target/
+
+# Android Studio / IntelliJ
+.idea/
+*.iml
+
+# Native temporary output
+.externalNativeBuild/
+.cxx/
+
+# OS / editor files
+.DS_Store
+Thumbs.db
+*~
+*.swp
+*.swo