Sample projects

[vova3211]

Projects:

1. Simple Razor project - (review/update/cleanup existing project - TestSite)
2. Simple Blazor project - example
3. IdentityServer4 project

If someone wants to grab this one, you are welcome.
Please create separate PR for each project.

[Ryanlewis2018]

If i can ever figure out IS 4 ill post it ive been trying to get a hosted Blazor WASM app to work but the server wants AddApiAuthorization and i havent cracked the code yet.

[HolyOne]

I am still trying to find out how AddApiAuthorization works with the latest Blazor webassembly app template using mongodb