Update README.md

Author: manchumahara

README.md

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+<p align="center" >
+  <img src="https://www.bkash.com/sites/all/themes/bkash/logo.png?87980">
+</p>
+
+ <h1 align="center">bKash(BD) Mobile Finance Payment Gateway for Flutter</h1>
+<p align="center" >
+<img src="#" />
+<img src="#" />
+</p>
+
+This is a Flutter package for [bKash](https://www.bkash.com/)) BD Payment Gateway. This package can be used in flutter project. We created this package while working for a project and thought to made it release for all so that it helps. 
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