Update README.md

Author: WingZer0o

README.md

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 # cas-typescript-sdk
 
+[![image](https://img.shields.io/badge/Discord-5865F2?style=for-the-badge&logo=discord&logoColor=white)](https://discord.gg/7bXXCQj45q)
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 Ever wanted all of your most useful cryptograpihc operations in one module and not have to surf documentation for various packages? 
 CAS is here to provide a unified development experience as an abstract layer to the RustCrypto and Dalek-Cryptography suite of algorithms.
 The official NPM page can be found [here](https://www.npmjs.com/package/cas-typescript-sdk).