How to build the application?

Gradle build tool is used to build the app.

Prior to building the app Gradle needs to know where Android SDK is. Please configure it using either local.properties file (add sdk.dir=PATH_TO_ANDROID_SDK) or ANDROID_HOME environmental variable.

To build all application variants please use following Gradle wrapper command:
./gradlew assemble (Use gradlew.bat on Windows OS)

After build is finished output apks are in /app/build/outputs/apk folder. Debug apk is signed with Android SDK debug key and release apk is unsigned.

How to import to Android Studio?

To import to Android Studio please use Open existing project option and select project root folder. After launch please use Sync with gradle options to fetch all dependancies and configure project.