docs: added a twitter shield (#6939)

## Description

Adds twitter link to sway_lang account
---------

Co-authored-by: Sophie Dankel <47993817+sdankel@users.noreply.github.com>

Author: Olexandr88

README.md

@@ -3,6 +3,7 @@
 [![build](https://github.com/FuelLabs/sway/actions/workflows/ci.yml/badge.svg)](https://github.com/FuelLabs/sway/actions/workflows/ci.yml)
 [![crates.io](https://img.shields.io/crates/v/forc?label=latest)](https://crates.io/crates/forc)
 [![docs](https://docs.rs/forc/badge.svg)](https://docs.rs/forc/)
+[![twitter](https://img.shields.io/twitter/follow/SwayLang)](https://x.com/SwayLang)
 [![discord](https://img.shields.io/badge/chat%20on-discord-orange?&logo=discord&logoColor=ffffff&color=7389D8&labelColor=6A7EC2)](https://discord.gg/xfpK4Pe)
 
 Sway is a language developed for the [Fuel](https://docs.fuel.network/docs/intro/what-is-fuel/) blockchain. It is heavily inspired by Rust and aims to bring modern language development and performance to the blockchain ecosystem.