Add-Migration Entity Framework Core (ef core) Nothing Happens

If you are out there wondering what is going on to your

add-migration

or

update-database

, same thing happened to me.
I have multiple startup projects in my Visual Studio 2017. The fix is to use your main WebApi / WebApp Project as the start up project
first before running the

add-migration

again and walahhh you are good to go kid. Your welcome.