Proposal to update help output

I was looking through the help output, and I think there are a few areas that we can improve.

To start the discussion, I’ve created a PR that captures the changes that I’m proposing at https://github.com/sayedihashimi/sayed-tools/pull/12. Below you’ll find direct links for each command that I looked at.

adding @mlorbetske @seancpeters @shanselman @richlander

Command	diff from existing	proposed help output for command
dotnet new	diff	proposal
dotnet new -h	diff	proposal
dotnet new -l	diff	proposal
dotnet new console -h	diff	proposal
dotnet new classlib -h	diff	proposal
dotnet new mstest -h	diff	proposal
dotnet new xunit -h	diff	proposal
dotnet new web -h	diff	proposal
dotnet new mvc -h	diff	proposal
dotnet new webapi -h	diff	proposal
dotnet new sln -h	diff	proposal
dotnet new we -l	diff	proposal
dotnet new -l -lang F#	diff	proposal
dotnet new -l -lang NotExists	diff	proposal
dotnet new NotExists	diff	proposal
dotnet new --install -h	diff	proposal
dotnet new --uninstall -h	diff	proposal

[KathleenDollard]

@richlander Understanding/triaging existing bugs and creating a path is part of the process.

[richlander]

I am curious what we are doing in this space. The dotnet new experience needs be fully thought through, IMO.

/cc @KathleenDollard