Add note on using VSCode or Cursor as EDITOR

Author: darrenburns

docs/guide/external_tools.md

@@ -27,6 +27,10 @@ export POSTING_EDITOR=vim
 
 If neither is set, Posting will try to use the `EDITOR` environment variable.
 
+!!! tip "Using VSCode or Cursor"
+
+    If you want to use VSCode or Cursor, you can set the `POSTING_EDITOR` environment variable to `code -w` or `cursor -w` respectively.
+
 ## External Pagers
 
 With a multi-line text area focused, press ++f3++ to open the file in your