Add example on how to use Sapphire wrapper with Wagmi

[CedarMist]

One project is using Wagmi + Sapphire: https://github.com/hashlips-lab/on-chain.id/blob/6fab03b97f49807115f6d291c2640f402f9a0de2/nextjs/lib/SapphireWagmi.tsx#L22

[CedarMist]

This is for Wagmi v1 not Wagmi v2.