create readme.md file

Signed-off-by: Amit Amrutiya <amitamrutiya2210@gmail.com>

Author: amitamrutiya

README.md

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+# GraphQL Crash Course - Build an Expense Tracker App [Live](https://expense-tracker-pur1.onrender.com/)
+
+![Demo App](https://i.ibb.co/ygxgbNm/Screenshot-11.png)
+
+Welcome to the MERN GraphQL Expense Tracker App! This project is designed to help you manage your expenses efficiently using a modern tech stack and GraphQL.
+
+## Features:
+
+-   🌟 Tech stack: MERN (MongoDB, Express.js, React.js, Node.js) + Apollo GraphQL
+-   📝 Learn type definitions and resolvers for defining GraphQL schema and data fetching logic
+-   🔄 Mutations for modifying data in the GraphQL API and establishing graph relations
+-   🎃 Authentication with Passport.js and MongoDB session store
+-   🚀 Global state management with Apollo Client
+-   🐞 Error handling both on the server and on the client
+-   ⭐ Deployment made easy with a platform called Render
+-   👾 Cron jobs for scheduled tasks and automation
+-   ⏳ And much more!
+
+### Setup .env file
+
+```js
+MONGO_URI=...
+SESSION_SECRET=...
+```
+
+### Build the app
+
+```shell
+npm run build
+```
+
+### Start the app
+
+```shell
+npm start
+```