Merge pull request Python-World#466 from Sulagna-Dutta-Roy/Sulagna

Billing system using tkinter.

Author: chavarera

projects/Billing_system/Bill.PNG

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+<h1>Billing system using Tkinter</h1>
+<p>This project can be used for any shops. User can store all the data and generate the bill.</p>
+
+<h2>Tech stack:</h2>
+<ul>
+    <li>Python</li>
+</ul>
+
+<h2>Libraries used:</h2>
+<ul>
+    <li>Tkinter</li>
+    <li>Os</li>
+    <li>Messagebox</li>
+</ul>
+
+<h3>To install external modules:</h3>
+<p><li>Run pip install tkinter</li></p>
+
+<h3>To execute the project:</h3>
+<p><li>Run billing system.py</li></p>
+
+<h3>Screenshot/GIF of this project.</h3>
+
+![Bill](https://user-images.githubusercontent.com/72568715/134779769-7695a727-adbb-43b7-9e60-1205dc982ae7.PNG)