Document gRPC Support

[philwebb]

We need documentation for the Spring gRPC Support.

Commits from Spring gRPC to consider:

• spring-projects/spring-grpc@d452f80
• spring-projects/spring-grpc@42cbea3
• spring-projects/spring-grpc@d41e3ab

Also #49689 is worth a look when documenting the behaviour of adding the plugin to a Maven build.

[DavJaveiro]

Hi! I’d love to help with documenting the Spring gRPC support.
Is this issue still open for contributions, or is someone already actively working on it?
thanks

[philwebb]

Thanks for the offer @DavJaveiro but I've already assigned this one to myself since we're still working though the code.