Added content in the readme

Author: RiyaGupta89

JAVASCRIPT BUTTON APP/README.md

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+<h1>Welcome to the Javascript Button App</h1>
+
+<p>Simple web app written in HTML, CSS, JAVASCRIPT where the user can select a color from the options that are given on the web app and as he clicks on that option, all the buttons background color changes to that color.</p>
+
+<h3>Used Technologies</h3>
+<ul>
+  <li>HTML5</li>
+  <li>CSS3</li>
+  <li>JavaScript</li>
+</ul>
+
+<h3>Use  of this Project</h4>
+<p>This project is for practicing HTML, CSS, JAVASCRIPT skils. This is good beginner friendly project to get started with. It changes the background color of the buttons.</p>
+
+#### Steps to Use:
+---
+
+- Download or clone the repository
+```
+git clone https://github.com/Ayushparikh-code/Web-dev-mini-projects.git
+```
+- Go to the directory
+- Open terminal 
+- Run 
+```
+cd '.\JAVASCRIPT BUTTON APP\'
+```
+- Then run 
+```
+node app.js
+```
+- Have a look at the webapp.
+
+
+##Screenshots
+
+![Demo1](public/images/challenge1.png)
+
+<br>
+
+![Demo2](public/images/challenge2.png)