Update README.md

Author: rdnasim

README.md

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  <h1 align="center">bKash(BD) Mobile Finance Payment Gateway Flutter Package</h1>
 <p align="center" >
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 [![Pub](https://img.shields.io/pub/v/flutter_bkash.svg)](https://pub.dartlang.org/packages/flutter_bkash)
 [![License](https://img.shields.io/badge/License-BSD_3--Clause-blue.svg)](https://opensource.org/licenses/BSD-3-Clause)
 [![PRs Welcome](https://img.shields.io/badge/PRs-welcome-brightgreen.svg)]()  [![Maintenance](https://img.shields.io/badge/Maintained%3F-yes-green.svg)]() 
@@ -139,6 +139,13 @@ Examples for see the `/example` folder.
 
 **Here is the example code** [link](https://github.com/codeboxrcodehub/flutter-bkash/blob/master/example/lib/main.dart)
 
+**Example Video Demo**
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+<div align="center">
+  <video src="https://github.com/codeboxrcodehub/flutter-bkash/assets/19654129/5f9e12ee-b5cb-4dc2-a522-0c631f1f7032" controls></video>
+</div>
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 ### Importance Notes
 - Read the comments in the example of code
 - See the documents and demo checkout [bKash API Specifications](https://developer.bka.sh/v1.2.0-beta/reference), [bKash Payment Checkout Demo](https://merchantdemo.sandbox.bka.sh/frontend/checkout)