As system, Nunit tests and results can be imported by REST API

The system should be able to import Nunit tests and results by using either the REST API or the "Import Execution Results" action within a Test Execution's issue screen.

Nunit is a testing framework for .Net languages and very common in C#.

References:

• https://github.com/nunit/docs/wiki/Test-Result-XML-Format
• https://github.com/nunit/docs/wiki