Android Gradle dependencies in README

[mattorib]

It would be helpful to have a list of the Android-related Gradle deps in the README. I'm not sure where the deps are listed specifically, but people probably should not have to either dig to find them or stumble through the run-android command and install them one at a time when it errors out.

If it's supposed to automatically grab them from online then that is not working, at least for me. My build process is only checking files.

[geremih]

The dependencies are listed in android/app/build.gradle. Running run-android should download them.