Add net core test (skipping for now)#238

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KvanTTT wants to merge 3 commits intomkaring:masterfrom

PositiveTechnologies:NetCoreTest

Commits on Oct 2, 2020

Add NetCoreTest.csproj and test, change net461 to netstandard2.0 in Confuser.UnitTest.csproj
KvanTTT
committed
Add Skip attribute with TODO to NetCore test
KvanTTT
committed
Try to update Visual Studio to 2019 to support netcore
KvanTTT
committed