Lowercase URL in .NET Core 2.1

https://stackoverflow.com/questions/40334515/automatically-generate-lowercase-dashed-routes-in-asp-net-core

Start with the linked Stack Overflow question to determine the intended lowercase URL behavior, then inspect the repository's ASP.NET Core 2.1 samples and README for the relevant entry point. Done means the requested behavior is demonstrated in the appropriate sample, with any necessary explanation included.

Written by the indexing model from the issue text.