Update readme (#207)

* Update readme

* Update README.md

Author: Alex Strachan

README.md

@@ -22,3 +22,11 @@ make test
 ```
 
 This should open a PR at https://github.com/speakeasy-api/sdk-generation-action-test-repo
+
+# When you're ready to test it as a live action
+Push your changes up to a branch
+
+Navigate to https://github.com/speakeasy-api/sdk-generation-action-test-repo/actions/workflows/action-test.yaml
+in the test repo.
+
+Click "run workflow" and put in your branch!