Update instructions

Thanks GitHub for changing the default settings here.

Author: martinthomson

README.md

@@ -7,6 +7,10 @@ Use this repository as a template if you want to start working on
 instructions](https://github.com/martinthomson/i-d-template/blob/main/doc/TEMPLATE.md)
 for more information.
 
-Once you have created your own repository, start work by renaming the
-`draft-todo-yourname-protocol.md` file
-[here](../../edit/main/draft-todo-yourname-protocol.md).
+Once you have created your own repository, start work by:
+
+1. Set "Workflow permissions" to "Read and write permissions"
+   [in the repository settings](../../settings/actions#actions_default_workflow_permissions_write).
+
+2. Rename the `draft-todo-yourname-protocol.md` file
+   [here](../../edit/main/draft-todo-yourname-protocol.md).