Sync .gitignore with the flutter/plugins repo

Author: mehmetf

.gitignore

@@ -1,14 +1,33 @@
 .DS_Store
 .atom/
-.idea
+.idea/
+.vscode/
+
 .packages
 .pub/
+.dart_tool/
 pubspec.lock
 
+Podfile
 Podfile.lock
 Pods/
+.symlinks/
+**/Flutter/App.framework/
+**/Flutter/Flutter.framework/
+**/Flutter/Generated.xcconfig
+**/Flutter/flutter_assets/
+ServiceDefinitions.json
+xcuserdata/
+
+local.properties
+.gradle/
+gradlew
+gradlew.bat
+gradle-wrapper.jar
+*.iml
+
 GeneratedPluginRegistrant.h
 GeneratedPluginRegistrant.m
-
 GeneratedPluginRegistrant.java
-
+build/
+.flutter-plugins