For main readme add additional info for how to register App in Speckle server

[knsolutions]

Maybe add link to Speckle docs for registering app in Speckle server or add few lines of text and maybe a picture on how to do it.

How to in Speckles own site:
https://speckle.guide/dev/apps.html#registering-an-application-on-the-speckle-server

Or the url where you can reg app in server: https://speckle.xyz/profile