On solution, ran operation 'Enable Nuget Package Restore'.
Per nuget recommendations, and after enabling Nuget Package Restore, remove packages folder from repo
Imported github/VisualStudio.gitignore amd integrated current gitignore
uncommented packages line from gitignore
Added Nunit.Runners to packages list.
Setup the debug to run nunit-x86.exe
Merge branch 'NugetChanges' of github.com:ericnewton76/System.IO.Abstractions
Purge .user file that's locally scoped and shouldn't be in source