Preparing to add GmsCore automated tests to Gradle build

Change-Id: I7fcde1dc2a783fd3056194c74852a221115d10d2
diff --git a/build.gradle b/build.gradle
new file mode 100644
index 0000000..cb65832
--- /dev/null
+++ b/build.gradle
@@ -0,0 +1,27 @@
+apply plugin: 'java'
+
+sourceSets {
+    main {
+        java {
+            srcDirs = ['src']
+            include 'org/**',
+                    'junit/extensions/**',
+                    'junit/runner/**',
+                    'junit/textui/**',
+                    'junit/framework/ComparisonCompactor.java',
+                    'junit/framework/JUnit4TestAdapterCache.java',
+                    'junit/framework/JUnit4TestAdapter.java',
+                    'junit/framework/JUnit4TestCaseFacade.java'
+        }
+    }
+}
+
+jar {
+    baseName 'junit4'
+    classifier 'target'
+}
+
+dependencies {
+    compile getAndroidPrebuilt('4')
+    compile project(':external:hamcrest')
+}
\ No newline at end of file