Angular-cli: Automatically `git add` files generated via `ng g`

[jelbourn]

When running ng g, none of the files are added to git automatically. Doing this for the user is one more (admittedly minor) step the CLI could capture.

[CaerusKaru]

This could be added as an option under defaults in .angular-cli.json, where addToGit can be enabled/disabled

[narainsagar]

Hi @jelbourn @hansl I think I can look & PR this! If you'd like me to look, Can you please provide me the _special_ instructions or details (if any) ? Thanks.