add skeleton

.gitignore

@@ -1,17 +1,43 @@
-# ---> Dart
-# Don’t commit the following directories created by pub.
-.buildlog
-.pub/
-build/
-packages
+# Miscellaneous
+*.class
+*.log
+*.pyc
+*.swp
+.DS_Store
+.atom/
+.buildlog/
+.history
+.svn/
+
+# IntelliJ related
+*.iml
+*.ipr
+*.iws
+.idea/
+
+# The .vscode folder contains launch configuration and tasks you configure in
+# VS Code which you may wish to be included in version control, so this line
+# is commented out by default.
+#.vscode/
+
+# Flutter/Dart/Pub related
+**/doc/api/
+.dart_tool/
+.flutter-plugins
+.flutter-plugins-dependencies
 .packages
+.pub-cache/
+.pub/
+/build/
 
-# Or the files created by dart2js.
-*.dart.js
-*.js_
-*.js.deps
-*.js.map
+# Web related
+lib/generated_plugin_registrant.dart
 
-# Include when developing application packages.
-pubspec.lock
+# Symbolication related
+app.*.symbols
 
+# Obfuscation related
+app.*.map.json
+
+# Exceptions to above rules.
+!/packages/flutter_tools/test/data/dart_dependencies_test/**/.packages