Update README.md

Author: skibitsky

README.md

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 # Web3Modal Unity
 
+[![openupm](https://img.shields.io/npm/v/com.walletconnect.web3modal?label=openupm&registry_uri=https://package.openupm.com)](https://openupm.com/packages/com.walletconnect.web3modal/)
+
 Your on-ramp to web3 multichain. Web3Modal is a versatile library that makes it super easy to connect player with your game and start interacting with the blockchain.
 
 #### 📚 [Documentation](https://docs.walletconnect.com/appkit/unity/core/installation)