NClient dotnet tool code generation

[Kingmidas74]

There is the first dirty imlementation.

Requirements:

• [x] Arch
• [x] Tests
• [x] Review
• [x] Help with nuget creation

Ideas:

• [x] Think about template engine

[Kingmidas74]

@smolchanovsky Can you help with templates? I can't determinate which attributes is required.

[smolchanovsky]

FYI, the test on the framework was not passed https://github.com/nclient/NClient/runs/4419485583?check_suite_focus=true#step:3:3553

[smolchanovsky]

Optional: when you execute the dotnet ef command, a funny message with help and version is displayed:

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

Entity Framework Core .NET Command-line Tools 6.0.0

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.

It would be great to do the same, if it's not difficult :)

[Kingmidas74]

Optional: when you execute the dotnet ef command, a funny message with help and version is displayed:

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

Entity Framework Core .NET Command-line Tools 6.0.0

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.

It would be great to do the same, if it's not difficult :)

Done