Add README.md

Author: jgunnink

README.md

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+# Vite, React and OAuth with Google Cloud Identity Platform
+
+This repo is designed to be used as a demo or template to build React applications with Vite, facilitating easy sign in with the
+[Google Cloud Identity Platform](https://cloud.google.com/identity-platform)
+
+In short, using the Firebase SDK, you can provide a `apiKey` and `authDomain` to the config (available via the GCP console identity
+platform) page, and that's pretty much it. It's all wired up.
+
+If the user is signed in, the app will display their name. If not it will display an error if there is one, or the sign in button to enable
+the user to sign in.
+
+PRs, issues, questions, praise, criticism is all welcome.
+
+Enjoy.