Need basic C++ "hello world" example(s) for libcugraph

[rlratzel]

This request has been made multiple times, but I couldn't find an issue for it so I'm creating this.

Users have requested (a recent hackathon was one know example of such a request) a simple "hello world" style C++ example that uses libcugraph. For now, we've been recommending the C++ unit tests, but these aren't optimized for demonstrating the API as much as they are just achieving test coverage.

One option could be to simply change the unit tests so they demonstrate the API better, or add additional tests that are better suited as examples and leave the other, harder-to-read tests in place for covering edge cases and other test scenarios. This is nice because it guarantees the examples work with the latest code changes since they'll be run as part of CI.

cc @ogreen

[ljdursi]

+1 - This would be very helpful for people who are already using libraries like boost::graph to understand for what use cases they should or shouldn't think about adopting libcugraph.

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