Do we have a complete example

[szguoxz]

I am using quinn, want to do the basic things:

1. generate a self-signed CA for server to use.
2. sign a certificate for the client to use.
3. Do we need to generate and seign a certificate for the server to use?

now we only have 1 example for 1. Can't find a complete example for #2 or #3..

[Kerwood]

I more examples on using this library would be very nice.
I'm currently searching around to figure out how to create a certificate pair with an existing CA.

Please add more examples on how to use this library.

[djc]

There's a minimal example in https://github.com/djc/sign-cert-remote from back when I first implemented CSR support.

[iamjpotts]

I built an example here - #99 - but it became larger in scope than rcgen.