docs(readme): add action token permissions

This automatically sets the correct permissions in the workflow definition so that the user doesn't have to change the default workflow permissions in the repo settings.

README.md

@@ -205,6 +205,8 @@ on: [ "push" ]
 jobs:
   build:
     runs-on: "ubuntu-latest"
+    permissions:
+      issues: write
     steps:
       - uses: "actions/checkout@v4"
       - name: "TODO to Issue"
@@ -228,6 +230,10 @@ on: [ "push" ]
 jobs:
   build:
     runs-on: "ubuntu-latest"
+    permissions:
+      contents: write
+      issues: write
+      pull-requests: write
     steps:
       - uses: "actions/checkout@v4"
       - name: "TODO to Issue"