Gradle project file.
Gradle project file.

Adds a gradle project file so that other projects can use the
:micro and :nano libraries.

Change-Id: I7e5aeb584acd11d39e57bf9d4ecfc3af175ffbb2

MonkeyZZZZ/platform_external_protobuf,geekboxzone/mmallow_external_protobuf,android-ia/platform_external_protobuf,MonkeyZZZZ/platform_external_protobuf,geekboxzone/mmallow_external_protobuf,xin3liang/platform_external_protobuf,MonkeyZZZZ/platform_external_protobuf,xin3liang/platform_external_protobuf,geekboxzone/lollipop_external_protobuf,geekboxzone/lollipop_external_protobuf,MonkeyZZZZ/platform_external_protobuf,android-ia/platform_external_protobuf,xin3liang/platform_external_protobuf,geekboxzone/mmallow_external_protobuf,geekboxzone/lollipop_external_protobuf,android-ia/platform_external_protobuf,xin3liang/platform_external_protobuf,geekboxzone/mmallow_external_protobuf,android-ia/platform_external_protobuf,geekboxzone/lollipop_external_protobuf,geekboxzone/lollipop_external_protobuf,geekboxzone/mmallow_external_protobuf,MonkeyZZZZ/platform_external_protobuf,xin3liang/platform_external_protobuf