docs(README): deployment

Author: gr2m

README.md

@@ -11,6 +11,11 @@ npm start
 
 Open http://localhost:3000 and follow instructions to register a GitHub App for testing. When done, an `.env` file with your app's credentials will exist.
 
+## Deployment through GitHub Actions
+
+1. Create `AZURE_CREDENTIALS` repository secret. See https://github.com/azure/login#configure-deployment-credentials for how to retrieve it from the Azure Console.
+2. Create `AZURE_FUNCTION_APP_PUBLISH_PROFILE` repository secret. See https://github.com/Azure/functions-action#using-publish-profile-as-deployment-credential-recommended for how to retrieve it from the Azure Console.
+
 ## License
 
 [ISC](LICENSE)