Setup container test for csharp

[neomatrix369]

• install mono and related components
• provided installBaboon script to install both inside the container and native envs
• renamed all dotnet to csharp

[neomatrix369]

Ran tests in ./tests/csharp/csharpCodeCoverageShould.sh for csharp and they pass, except one which fails for a good reason:

~~~ Summary of test executions ~~~
  ~~~ Passed Tests ~~~
  language=csharp|challenge=SUM|expected=100|actual=100
  language=csharp|challenge=CHK|expected=0|actual=0
  language=csharp|challenge=xyz|expected=0|actual=0
  3 test(s) passed

  ~~~ Failed Tests ~~~
  language=csharp|challenge=TST|expected=50|actual=0
  1 test(s) failed

We don't have a challenge called TST with 50 coverage, I checked one runner which didn't have any implementation for it, im guessing all other runners will see this test fail - are you aware?

[neomatrix369]

@julianghionoiu I strongly suggest we clone XR.Baboon into your git org, and clone from there, just as a precautionary measure

[julianghionoiu]

Looks good. Merge once all tests are passing.