Documentation: List of editor plugins (#490)

Documentation/EditorIntegration.md

+The following editor plugins for delve are available:
+
+* [Golang Plugin for IntelliJ IDEA](https://github.com/go-lang-plugin-org/go-lang-idea-plugin)
+* [Go for Visual Studio Code](https://github.com/Microsoft/vscode-go)
+* [Emacs plugin](https://github.com/benma/go-dlv.el/)
+* [LiteIDE](https://github.com/visualfc/liteide)
+* [Go Debugger for Atom](https://github.com/lloiser/go-debug)

Documentation/README.md

@@ -6,3 +6,4 @@ Documentation for the project will reside in this directory.
 - [Usage](usage)
 - [API](api)
 - [Internal](internal)
+- [Editor Integration](EditorIntegration.md)