Need help setting up VS solution Repository

I must be missing something? I would like to move my local visual studio solution to a GitHub repository. The solution is composed of multiple projects. The solution Name is Restaurant (Restaurant.sln) within that Solution I have the following projects:
Restaurant.csproj - this is a WPF projects
RestaurantAPI.csproj - this is a .net core API
RestaurantDB.csproj - this is a Sql Server solution
RestaurantModels.csproj - this is a .Net DLL
RestaurantApp - this is a Xamarin Forms projects
RestaurantApp.Android
RestaurantApp.iOS

When I right mouse click on the solution and create a GitHub Restaurant Repository, then push it, the only thing I find in the repository is the code for Restaurant.csproj.

How do I add the other projects to this repository?