Enabling .NET Standard support on UWP apps targeting 15063 or below is relatively simple.
Set your project's TargetPlatformMinVersion
to anything above 15063, for this I've always used 16299 but other SDKs should work the same way
Open your .csproj
file in a text editor (right click, "Unload project", right click again, "Edit project file"), and add the following 2 lines to the first property group.