add prject in sln file using cli code example

Example 1: dotnet core sloution

dotnet new sln --name my-solution
dotnet new [type] --name my-project 
dotnet sln add my-project/my-project.csproj
dotnet sln list
dotnet restore
dotnet build my-solution.sln

Example 2: how to add project to solution command line

$ dotnet sln add "src\CliApp\CliApp.csproj"
Project `src\CliApp\CliApp.csproj` added to the solution.