Make it streamlined to setup a new project dir with `wkg get`?

When you are setting up a new project dir, usually we want the `wit` directory structure.

After running, `wkg get namespace:package` to download a `wit` package`.
Should `wit` packages automatically be placed in `./wit` dir, creating it if not exists?

Or should `wkg get namespace:package -o wit/` create the `wit` dir if it doesn't exist?

`wkg wit fetch` assumes you are in a dir that has the `wit` sub dir.

Should `wkg get namespace:package` have a `--fetch-deps` or arg? To scaffold out the `wit` dir.