Add section to contributing file

CONTRIBUTING.md

@@ -79,4 +79,13 @@ First, ask yourself if you can build the Script Command without any dependencies
 
 All Script Commands are executed in a non-login shell to avoid additional information loaded from profiles that aren't relevant to Raycast. With an argument after a shebang, you can run a script in a login shell, e.g. `#!/bin/bash -l`. We don't allow Script Commands that make use of this feature in this repository. Mainly to guarantee easy portability, explicit injection of information and best performance. 
 
-*NOTE:* We will add support for environmental variables in Raycast and keep track of it in [this issue](https://github.com/raycast/script-commands/issues/77).
+*NOTE:* We will add support for environmental variables in Raycast and keep track of it in [this issue](https://github.com/raycast/script-commands/issues/77).
+
+### Auto generated files
+
+There are some files auto generated by our Toolkit after each commit pushed to this repository, for now, this is the list of files:
+
+- `commands/README.md`
+- `commands/extensions.json`
+
+Remember to keep these files unchanged. All manual changes will be lost when our integration workflow is performed. The information used to fill these files is collected from the Script Commands pushed to this repository. No changes on your side in these files are necessary.