Solution created with:
dotnet new sln
Then projects created:
dotnet new api -o calendar/adapter
dotnet new classlib -o calendar/application
dotnet new api -o calendar/domain
Then:
dotnet sln add .\CounselingScheduler.sln .\calendar\adapter
dotnet sln add .\CounselingScheduler.sln .\calendar\application
dotnet sln add .\CounselingScheduler.sln .\calendar\domain