Include C Examples

[mmstick]

There's some statistical evidence that most programmers evaluate, and learn how to use, libraries by their examples included with the project. So, it would be a good idea to include some examples for the C library so that C program authors will have a good idea about what's involved in getting this integrated with their projects.

[afbjorklund]

Here is one example: https://github.com/cherry-pick/com.redhat.resolver/tree/master/src

But something more "hello world" would probably be a good idea to include as documentation.

[ghost]

It's not mentioned in readme, but the tests feature several basic examples. The server-client example is the most complete: test-server-client.c

[haraldh]

added to README