Initial walking skeleton implementation

app/.gitignore

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+# Gradle
+.gradle/
+build/
+*/build/
+
+# Local configuration
+local.properties
+
+# Android Studio / IntelliJ
+.idea/
+*.iml
+
+# Generated files
+captures/
+.externalNativeBuild/
+.cxx/
+
+# Kotlin
+*.kotlin_module
+
+# Logs
+*.log
+
+# OS files
+.DS_Store
+Thumbs.db
+
+# Keystore files
+*.jks
+*.keystore
+
+# Android profiling
+*.hprof
+
+# Temporary files
+tmp/
+temp/
+
+# APK / Bundle outputs
+*.apk
+*.aab
+
+# Emulator / device files
+*.lock
+
+# Navigation editor temp files
+.navigation/
+
+# Generated folders
+bin/
+out/
+
+# Mac
+.AppleDouble
+.LSOverride
+
+# Windows
+ehthumbs.db
+Desktop.ini
+
+# VSCode
+.vscode/
+
+# JetBrains cache
+.idea/caches/
+.idea/libraries/
+.idea/modules.xml
+.idea/workspace.xml
+.idea/navEditor.xml
+.idea/assetWizardSettings.xml