Integration Notes Needed for Spectre and LetheKit

[shannona]

It'd be useful to talk about Catalyst integrating with LetheKit and with Spectre. @gorazdko is this something you could take on?

These would be updates to: https://github.com/BlockchainCommons/GordianCosigner-Catalyst/blob/master/Docs/Integrating.md

Thanks!

[gorazdko]

Will do!