Usage/Help commands

[Matthiee]

I'm currently in favor of the EF.Core CLI help/usage style.

Example

PM> dotnet ef

                     _/\__       
               ---==/    \\      
         ___  ___   |.    \|\    
        | __|| __|  |  )   \\\   
        | _| | _|   \_/ |  //|\\ 
        |___||_|       /   \\\/\\

Entity Framework Core .NET Command-line Tools 2.2.0-preview2-35157

Usage: dotnet ef [options] [command]

Options:
  --version        Show version information
  -h|--help        Show help information
  -v|--verbose     Show verbose output.
  --no-color       Don't colorize output.
  --prefix-output  Prefix output with level.

Commands:
  database    Commands to manage the database.
  dbcontext   Commands to manage DbContext types.
  migrations  Commands to manage migrations.

Use "dotnet ef [command] --help" for more information about a command.

PM> dotnet ef database --help


Usage: dotnet ef database [options] [command]

Options:
  -h|--help        Show help information
  -v|--verbose     Show verbose output.
  --no-color       Don't colorize output.
  --prefix-output  Prefix output with level.

Commands:
  drop    Drops the database.
  update  Updates the database to a specified migration.

Use "database [command] --help" for more information about a command.

Todo

• Create command without options #11 Create Command
• Description output
• Format usage
• Setup default convention