Docs: update README.md (#4184)

Add some general info about Safe Wallet

README.md

@@ -5,7 +5,9 @@
 ![GitHub package.json version (branch)](https://img.shields.io/github/package-json/v/safe-global/safe-wallet-web)
 [![GitPOAP Badge](https://public-api.gitpoap.io/v1/repo/safe-global/safe-wallet-web/badge)](https://www.gitpoap.io/gh/safe-global/safe-wallet-web)
 
-The default Safe web interface.
+Safe{Wallet} is a smart contract wallet for Ethereum and other EVM chains. Based on Gnosis Safe multisig contracts.
+
+This repository is the frontend of the Safe{Wallet} app.
 
 ## Contributing