eg@debian:~$ dotnet sln add --help
Description:
Add one or more projects to a solution file.
Usage:
dotnet sln <SLN_FILE> add [<PROJECT_PATH>...] [options]
Arguments:
<SLN_FILE> The solution file to operate on. If not specified, the command will search the current directory for one. [default: /home/eg/]
<PROJECT_PATH> The paths to the projects to add to the solution.
Options:
--in-root Place project in root of the solution, rather than creating a solution folder.
-s, --solution-folder <solution-folder> The destination solution folder path to add the projects to.
-?, -h, --help Show command line help.