add gitignore

.gitignore

@@ -0,0 +1,54 @@
+*.iml
+.gradle
+/local.properties
+/.idea/workspace.xml
+/.idea/libraries
+.DS_Store
+/build
+/captures
+
+# AndroidStudioGitIgnore
+Android Studio .gitignore
+
+#built application files
+*.apk
+*.ap_
+
+# files for the dex VM
+*.dex
+
+# Java class files
+*.class
+
+# generated files
+bin/
+gen/
+out/
+build/
+/*/build/
+
+# Local configuration file (sdk path, etc)
+local.properties
+
+# Windows thumbnail db
+Thumbs.db
+
+# OSX files
+.DS_Store
+
+# Eclipse project files
+.classpath
+.project
+
+# Android Studio
+*.iml
+.idea
+
+# Local IDEA workspace
+.idea/workspace.xml
+
+# Gradle cache
+.gradle
+
+#NDK
+obj/