Add LSP/DAP configuration section on external editors

_tools/codespell-ignore.txt

@@ -4,3 +4,4 @@ lod
 que
 raison
 uint
+implementors

tutorials/editor/external_editor.rst

@@ -68,3 +68,45 @@ We have official plugins for the following code editors:
 
 - `Visual Studio Code <https://github.com/godotengine/godot-vscode-plugin>`_
 - `Emacs <https://github.com/godotengine/emacs-gdscript-mode>`_
+
+LSP/DAP support
+---------------
+
+Godot supports the `Language Server Protocol <https://microsoft.github.io/language-server-protocol/>`_ (**LSP**) for code completion and the `Debug Adapter Protocol <https://microsoft.github.io/debug-adapter-protocol/>`_ (**DAP**) for debugging. You can check the `LSP client list <https://microsoft.github.io/language-server-protocol/implementors/tools/>`_ and `DAP client list <https://microsoft.github.io/debug-adapter-protocol/implementors/tools/>`_ to find if your editor supports them. If this is the case, you should be able to take advantage of these features without the need of a custom plugin.
+
+To use these protocols, a Godot instance must be running on your current project. You should then configure your editor to communicate to the running adapter ports in Godot, which by default are ``6005`` for **LSP**, and ``6006`` for **DAP**. You can change these ports and other settings in the **Editor Settings**, under the **Network > Language Server** and **Network > Debug Adapter** sections respectively.
+
+Below are some configuration steps for specific editors:
+
+Visual Studio Code
+^^^^^^^^^^^^^^^^^^
+
+You need to install the official `Visual Studio Code plugin <https://github.com/godotengine/godot-vscode-plugin>`_.
+
+For **LSP**, follow `these instructions <https://github.com/godotengine/godot-vscode-plugin#gdscript_lsp_server_port>`_ to change the default LSP port. The connection status can be checked on the status bar:
+
+.. image:: img/lsp_vscode_status.png
+
+For **DAP**, specify the ``debugServer`` property in your ``launch.json`` file:
+
+.. code-block:: json
+
+    {
+        "version": "0.2.0",
+        "configurations": [
+            {
+                "name": "GDScript Godot",
+                "type": "godot",
+                "request": "launch",
+                "project": "${workspaceFolder}",
+                "port": 6007,
+                "debugServer": 6006,
+            }
+        ]
+    }
+
+Emacs
+^^^^^
+
+Check the official instructions to configure `LSP <https://github.com/godotengine/emacs-gdscript-mode#auto-completion-with-the-language-server-protocol-lsp>`_, and `DAP <https://github.com/godotengine/emacs-gdscript-mode#using-the-debugger>`_.
+