DOC Document required permissions

README.md

@@ -13,6 +13,8 @@ steps:
 
 This action has no inputs
 
+GitHub job permissions required: `contents: write, actions: write`
+
 ## CMS major version detection
 
 This action will identify the CMS major version which is determined by parsing the contents on the modules `composer.json` using logic in the `funcs.php` file. In cases where the major version remains indeterminable, the action will fail. This is most likely if the module is not intended as an addon for a website.