Add client example

[Jonathan-Landeed]

A client example of best practices would be good. I assume we're supposed to use an interceptor to add auth headers, but right now the only interceptor example in the connectrpc docs is using req.Spec().IsClient magic. This project just moves the server-side portion of the interceptor to middleware to avoid unauthenticated resource usage, correct?

[emcfarlane]

Hi @Jonathan-Landeed, yes thats correct. To avoid unmarshalling messages and any extra work the authnetication is done above the connectrpc handler layer. There are some API changes being worked on (see #9) but will update the examples when these land. The best place to see usage is in the godocs https://pkg.go.dev/connectrpc.com/authn#example-package-BasicAuth