Update README.md

Added android apk download link

README.md

@@ -7,6 +7,9 @@
 <div align="center">
 Service made to allow transactions of mess coupons between IIIT-Bh Students.
 
+<a href="https://github.com/p-society/coupon-aggregator-client/releases/download/v1.0.0-alpha/app-release.apk">Download Android App</a>
+
+
 <h3>P-Society Handles</h3>
 <h3 align="center">
 	<a href="https://dev-psoc.netlify.app/">Website</a>