Add RubyMine plugin

EDITORS.md

@@ -17,7 +17,8 @@ new H2 header in this file containing the instructions. -->
 - [Emacs Eglot](#Emacs-Eglot)
 - [Neovim LSP](#Neovim-LSP)
 - [Sublime Text LSP](#sublime-text-lsp)
-- [Zed](#zed-some-limitations)
+- [Zed](#zed)
+- [RubyMine](#RubyMine)
 
 ## Emacs Eglot
 
@@ -132,14 +133,18 @@ To configure the Ruby LSP using [LSP for Sublime Text](https://github.com/sublim
 
 Restart LSP or Sublime Text and `ruby-lsp` will automatically activate when opening ruby files.
 
-## Zed (some limitations)
+## Zed
 
 [Setting up Ruby LSP](https://github.com/zed-industries/zed/blob/main/docs/src/languages/ruby.md#setting-up-ruby-lsp)
 
 [Zed has added support for Ruby LSP as a alternative language server](https://github.com/zed-industries/zed/pull/11768) in version v0.0.2 of the Ruby extension.
 
 See https://github.com/zed-industries/zed/issues/4834 for discussion of the limitations.
 
-## RubyMine (not yet supported)
+## RubyMine
 
-Although there is overlap between the features provided by RubyMine and Ruby LSP, there may be benefits in using both together. RubyMine has a [LSP API](https://blog.jetbrains.com/ruby/2023/07/the-rubymine-2023-2-beta-updated-ai-assistant-lsp-api-for-plugin-developers-and-more/), so adding support would involve writing a plugin using Kotlin. The [rubymine-sorbet-lsp](https://github.com/simoleone/rubymine-sorbet-lsp) project may be a useful reference for this.
+You can use the Ruby LSP with RubyMine or Intellij Ultimate through the following plugin.
+
+Note that there might be overlapping functionality when using it with RubyMine, given that the IDE provides similar features as the ones coming from the Ruby LSP.
+
+[https://plugins.jetbrains.com/plugin/24413-ruby-lsp](Ruby LSP plugin)