Create perf tests with BenckmarkDotNet

[realvizu]

Create perf tests with BecnhmarkDotNet that we can use to detect performance degradation when implementing new features.

Questions:

• What should be the subject of the benchmarks?
  • A real-life codebase would be preferred to some synthetic (generated) test subject. Also, it should be stable, eg. a concrete version of a project on GitHub?
  • Eg. a concrete former version of NsDepCop itself?
• What would be the benchmarking process?
  • I guess only those benchmars can be compared that were executed on the same machine. So if someone implements a new feature that is a potential perf. hit, then he should execute a benchmark with and without the new feature?