Decide on and Add StyleCop settings

[grleachman]

Would it be an idea to use some standard settings for the project?

This would probably need to be phased.

• Decide on a set of StyleCop settings to use (covering both c# and blazor), that would impact the project minimally, perhaps using warnings first.
• Ensure any commits do not produce new warnings
• Reduce warnings
• Set warnings to Errors

[csharpfritz]

I think we would want to add stylecop settings to the main library and test project first, and consider the samples for a later pass