Add README

Author: khrystynaklochko

7-defi-devpost/coupon/README.md

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+## Coupon javascript app POC
+This is a blueprint application POC for potential use of Wallet SDK to create cupons for integration with e-commerce.
+I had troubles with registering an app and using npm package and happy to create js package if an idea kicks in!
+
+For time being use js sample server to check a concept.
+ - UI app is under  `coupon-ui ` folder.
+ - Server app is under  `coupon-js ` folder.
+ Instructions are inside README of each folder.