add C++ examples for ctypes

[adam-dziedzic]

Where to put new files:

• New files should go into a top-level subfolder, named after the article slug. For example: my-awesome-article

How to merge your changes:

1. Make sure the CI code style tests all pass (+ run the automatic code formatter if necessary).
2. Find an RP Team member on Slack and ask them to review & approve your PR.
3. Once the PR has one positive ("approved") review, GitHub lets you merge the PR.
4. 🎉

[Znunu]

Hi!
Thanks a lot. While I can't test them, I think they look great. I see you even bothered to make it cross platform which is nice.
There seems to be a slight overlap with thir PR. Can you take a look?
I think you need to find jima80525, if you want this merged. He's the one who wrote the article and code files.

[jima80525]

Looks good!

[jima80525]

This is a good addition! nice

[dbader]

Cool, LGTM :) @jima80525 Do we need to make any updates to the article before I merge this or is this just a bonus added to the materials example code?

[jima80525]

@dbader - it changes the output slightly (by adding a library: libcmult.so line to the display, but I wouldn't say that's worth an article update. If it's a big deal, I'd remove it from here, but I don't feel like that will confuse anyone.