Add Discord badge (#237)

Author: ferranbt

README.md

@@ -1,6 +1,11 @@
 
 # Eth-Go
 
+[![Chat Badge]][chat link]
+
+[chat badge]: https://img.shields.io/badge/chat-discord-%237289da
+[chat link]: https://discord.gg/5A6Qm2u4yK
+
 Ethgo is a lightweight SDK in Go to interact with Ethereum compatible blockchains.
 
 - Website: https://ethgo.dev