Added readme

README.md

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+# Introduction
+This is a simple Google OAuth login example using Fastify and Passport.
+
+# Setup
+[Fastify-secure-session](https://www.npmjs.com/package/fastify-secure-session) is being used for session management. You will need a secret-key to run this code.
+
+`npx fastify-secure-session > secret-key`
+
+Place the secret key in the base folder.
+
+You will need to create a **.env** file in the base folder with these two variables that you will get from your Google Console
+```
+AUTH0_CLIENT_ID=clientID from Google
+AUTH0_CLIENT_SECRET=Secret from Google
+```
+Make sure you add the gmail address you plan to login with to the allowed users list
+
+# Run
+
+To run the code 
+`npm run start`
+and visit http://localhost:8080/