[Doc] Adding readme

examples/streamlit/app-with-auth0/readme.md

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+# Authentication
+
+Our seamless integration with Auth0 enables you to add robust authentication to any Streamlit app effortlessly. There's no need to modify your existing Streamlit app code!
+
+## User Information Retrieval
+
+If you need to access user information returned by Auth0, this repository provides a practical example demonstrating how to do so.
+
+## Learn More
+
+For more information about authentication in Ploomber Cloud, including setup instructions, please refer to our official documentation:
+
+[Ploomber Cloud - Streamlit Authentication Documentation](https://docs.cloud.ploomber.io/en/latest/apps/streamlit.html#authentication)