更新gitignore

Author: Koswu

.gitignore

@@ -1,2 +1,24 @@
-/build
-/app/build/
+#built application files 
+*.apk *.ap_ 
+# files for the dex VM 
+*.dex
+# Java class files
+*.class
+# generated files
+bin/ gen/ out/ 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/