GNU Make solution

[jastein693]

Description

GNU Make prime sieve solution

Contributing requirements

• [x] I read the contribution guidelines in CONTRIBUTING.md.
• [x] I placed my solution in the correct solution folder.
• [x] I added a README.md with the right badge(s).
• [x] I added a Dockerfile that builds and runs my solution.
• [x] I selected drag-race as the target branch.
• [x] All code herein is licensed compatible with BSD-3.

[rbergen]

@jastein693 I see you're using a submodule in this solution. I think it may be good to include the instructions for pulling in the submodule in the README. Submodules are not used that often, and they're not pulled/updated automatically when one clones or pulls the parent repo.

In this case it could be done by running git submodule update --init gmsl from your solution's directory. There's a section in the first CUDA solution's README, the first few lines of which you could use as inspiration for the README text.