chore: add note about how to attach debugger (#6273)

* chore: add note about how to attach debugger

* Update CONTRIBUTING.md

Co-authored-by: Matt Kane <m@mk.gg>

* Apply suggestions from code review

Co-authored-by: Eduardo Bouças <mail@eduardoboucas.com>

* Update CONTRIBUTING.md

---------

Co-authored-by: Matt Kane <m@mk.gg>
Co-authored-by: Eduardo Bouças <mail@eduardoboucas.com>

CONTRIBUTING.md

@@ -89,6 +89,16 @@ or (`DEBUG=true` enables printing stack traces when errors are thrown):
 DEBUG=true ./bin/run.js [command]
 ```
 
+### Attaching a Debugger
+
+When debugging a project, it's super helpful to attach a debugger to the CLI. If you use VS Code, here's how you can do it:
+
+1. Open this repository in VS Code.
+2. Open a "JavaScript Debug Terminal" (e.g. by searching for it in the Command Palette (Shift-Cmd+P)). Every Node process that's opened in this terminal will have a debugger attached.
+3. Place a breakpoint somewhere in the CLI. You will have to place them in the compiled `.js` files as opposed to the `.ts` files.
+4. In your JavaScript Debug Terminal, navigate to the project you'd like to debug.
+5. Run `/path/to/netlify/cli/bin/run.js`. The debugger should be connecting automatically.
+
 ### Architecture
 
 The CLI is written using the [commander.js](https://github.com/tj/commander.js/) cli interface and the