Update README.md

Author: suman889

README.md

@@ -1,3 +1,6 @@
+Demo
+![caption](https://github.com/suman889/React/blob/main/2021-08-06-07-30-28.gif)
+
 
 1. use CoinGecko API
 2. What is NPM Axios?
@@ -19,4 +22,4 @@ Hooks are a new addition in React 16.8. They let you use state and other React f
 
  import React, {useState, useEffect} from 'react';
  =>{useState, useEffect} this is react hook 
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