Taskfile initialization is too verbose

[HeCorr]

Summary

When initializing a new Taskfile with --init, it prints the whole file contents to the terminal, which I find unnecessarily verbose.
Also, the -s, --silent flags don't seem to affect it at all.

Suggestion

Both:

• make --init take --silent into account and don't print non-error messages if it is present, and
• print just the filename instead of the file contents by default: Taskfile.yml created in the current directory
  • additionally, hook up -v, --verbose to print the file contents if the user does want it

[HeCorr]

@andreynering it's okay to (re-)assign me here as well, I can work on both.