add tweet button

Author: solkimicreb

README.md

@@ -1,6 +1,6 @@
 # React Easy State
 
-Simple React state management. Made with :heart: and ES6 Proxies.
+Simple React state management. Made with :heart: and ES6 Proxies. [![Tweet](https://img.shields.io/twitter/url/http/shields.io.svg?style=social)](https://twitter.com/intent/tweet?text=Simple%20React%20state%20management.%20Made%20with%20%E2%9D%A4%EF%B8%8F%20and%20ES6%20Proxies.&url=https://github.com/solkimicreb/react-easy-state&hashtags=reactjs,webdev,javascript)
 
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