Updated gitignore file include artifacts of gradle build system.

Change-Id: Ifaaa346abd489721ddbe3322cdcfafee9d4ddc8f
diff --git a/.gitignore b/.gitignore
index 2dd1573..3d03f71 100644
--- a/.gitignore
+++ b/.gitignore
@@ -37,3 +37,11 @@
 
 #gitignore file
 .gitignore
+
+##Gradle-based build
+.gradle
+build/
+gradle/
+gradlew
+gradlew.bat
+settings.gradle
\ No newline at end of file