chore: add Makefile for easier debug builds

Add Makefile with targets for building, installing, and running debug
builds on connected devices. Update DEVELOPMENT.md to document the
available make targets.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Makefile

@@ -0,0 +1,30 @@
+.PHONY: build install run clean test help
+
+# Default target
+help:
+	@echo "Available targets:"
+	@echo "  build   - Build debug APK"
+	@echo "  install - Build and install debug APK on connected device"
+	@echo "  run     - Build, install, and launch the app"
+	@echo "  clean   - Clean build artifacts"
+	@echo "  test    - Run unit tests"
+
+# Build debug APK
+build:
+	./gradlew assembleDebug
+
+# Build and install debug APK on connected device
+install: build
+	adb install -r app/build/outputs/apk/debug/app-debug.apk
+
+# Build, install, and launch the app
+run: install
+	adb shell am start -n com.matedroid/.MainActivity
+
+# Clean build artifacts
+clean:
+	./gradlew clean
+
+# Run unit tests
+test:
+	./gradlew testDebugUnitTest

docs/DEVELOPMENT.md

@@ -95,9 +95,19 @@ Without secrets, the APK is signed with a debug keystore (fine for sideloading,
 ### Development Workflow
 
 1. Start your Android emulator or connect a device
-2. Build and install: `./gradlew installDebug`
+2. Build and install: `make install`
 3. View logs: `adb logcat | grep -i matedroid`
 
+#### Makefile Targets
+
+| Target | Description |
+|--------|-------------|
+| `make build` | Build debug APK |
+| `make install` | Build and install debug APK on connected device |
+| `make run` | Build, install, and launch the app |
+| `make clean` | Clean build artifacts |
+| `make test` | Run unit tests |
+
 Or use Android Studio:
 1. Open the project folder
 2. Wait for Gradle sync