settings.gradle for Dialer

+ settings.gradile
+ android.properties
+ repositories.properties

These files will be symlinked to the root by the manifest.
repositories.properties is left empty for now. This file is used to
reference external repositories, and we don't need any right now.

+ gradlew

Script for gradle wrapper. Recommended to copy into project instead
of referencing.

Bug:26676586
Change-Id: I2a18a94dd47def97ea89407b52d6f4434dd7e665