Add new unit tests to CircleCI and other small fixes (#51)

* [DOTNET-7] Add test-results directory to gitignore list
* [DOTNET-8] Add new unit tests to CircleCI
* [DOTNET-9] Change the license name in the README.md file

Change dotCover command and add support for Junit Logger (#46)

This is a required fix after changing the code cover tool to JetBrains.dotCover.CommandLineTools.

Bump to version 4.0.0 on project file