Add community info

Author: ericdallo

README.md

@@ -91,3 +91,8 @@ Running a test interactively:
 :grey_question: `LSP :: No LSP server for dart-mode(check *lsp-log*).`
 
 :small_blue_diamond: Try to set the `lsp-dart-sdk-dir` to the Dart SDK dir instalation or if you are using Flutter, `<your-flutter-dir>/bin/cache/dart-sdk/`.
+
+## Community
+All feedback and suggestions are welcome!
+
+You can [open a issue](https://github.com/emacs-lsp/lsp-dart/issues/new/choose) or for a quick anwser, send a message on [Gitter](https://gitter.im/emacs-lsp/lsp-mode).