mesh android app setup

Dear Sir,

Want to test out nRF52 BLE mesh,  I downloaded the Android library from

https://github.com/NordicSemiconductor/Android-nRF-Mesh-Library

But don't know how to run it in Android Studio. ( V 3.1.2 ).

Do you have detail step on how to open an example in these files?  

there is no projects to be open, 

should import an module or project?

Thanks!