Update README with Telegram group link and badge (#843)

* Update README.md

* add link to tg group

Author: juanbono

README.md

@@ -3,7 +3,7 @@
 
 ### 🦀 Starknet in Rust 🦀
 
-Starknet library in Rust, featuring [⚡cairo-vm⚡](https://github.com/lambdaclass/cairo-vm)
+Starknet transaction execution library in Rust, featuring [⚡cairo-vm⚡](https://github.com/lambdaclass/cairo-vm)
 
 [Report Bug](https://github.com/lambdaclass/starknet_in_rust/issues/new?labels=bug&title=bug%3A+) · [Request Feature](https://github.com/lambdaclass/starknet_in_rust/issues/new?labels=enhancement&title=feat%3A+)
 
@@ -13,8 +13,8 @@ Starknet library in Rust, featuring [⚡cairo-vm⚡](https://github.com/lambdacl
 [![Telegram Chat][tg-badge]][tg-url]
 
 [pr-welcome]: https://img.shields.io/static/v1?color=orange&label=PRs&style=flat&message=welcome
-[tg-badge]: https://img.shields.io/static/v1?color=green&logo=telegram&label=chat&style=flat&message=join
-[tg-url]: https://t.me/starknet_rs
+[tg-badge]: https://img.shields.io/endpoint?url=https%3A%2F%2Ftg.sumanjay.workers.dev%2FLambdaStarkNet%2F&logo=telegram&label=chat&color=neon
+[tg-url]: https://t.me/LambdaStarkNet
 
 </div>