add link to the tutorial blog post

Author: bahmutov

README.md

@@ -86,6 +86,8 @@ package = "netlify-plugin-cypress"
 
 The following parameters can be used with "onSuccess" tests: `record`, `group`, `tag`, `spec`.
 
+Read the full tutorial [Test Sites Deployed To Netlify Using netlify-plugin-cypress](https://glebbahmutov.com/blog/test-netlify/).
+
 **Note:** if any tests against the deployed URL fail, the Netlify build still considers it a success. Thus if you want to have a test check against the deploy, install [Cypress GitHub App](https://on.cypress.io/github-integration). The app will provide its own failing status check in this case.
 
 ### recording