Added readme file for gradle builds to template.

Change-Id: I9fcd8986b954bfb27048d02733a760f2bb9ba47f
diff --git a/templates/create/Readme.gradle.txt b/templates/create/Readme.gradle.txt
new file mode 100644
index 0000000..3f034f4
--- /dev/null
+++ b/templates/create/Readme.gradle.txt
@@ -0,0 +1,6 @@
+Build Instructions
+-------------------
+This sample uses the Gradle build system. To build this project, use the
+"gradlew build" command or use "Import Project" in Android Studio.
+
+To see a list of all available commands, run "gradlew tasks".
\ No newline at end of file