using open3 instead of backticks to capture out, err, status separately

added some steps, checking for logs

adding hw folder to contain homeworks

moved ruby-intro to  hw folder
adding cucs for HW_0: check rag setup
Added Runs the AutoGrader Scenario
adding cucs for HW_0: checking expected results
Added failing test for skeleton results
adding cucs for HW_0: adding universal testing scenario
refactored multiple scenarios into Scenario Outline, ready for pull req
merge with paul: finishing cucs for hw_0