[PROPOSAL] Adding a performance project to MathSharp

[Kavignon]

Proposal:

To make sure there is no performance regression in the repository, having a benchmark project in the solution is a good first step. Then we can start from there adding some automation (CI) to make sure a PR won’t impact the code negatively.

I proposed using the NuGet BenchmarkDotNet which is pretty much an industry standard.

[john-h-k]

seems useful, benchmark dot net is a given yeah. I'm away for a week but am happy to review any PRs to start work on this

[Kavignon]

Will add a performance project in the solution and 1 or 2 benchmarks to get us started in here.

[Kavignon]

Done here #41