Created readme

Author: Madhav Poudel

README.md

@@ -0,0 +1,16 @@
+# GraphQL API Tutorial
+
+```bash
+npm install
+npm start
+```
+
+```bash
+yarn
+yarn start
+```
+
+## GraphQL API endpoint
+```js
+http://localhost:3000/graphiql
+```