`prmd init` `prmd verify`s

Currently a schema that is bootstrapped with `prmd init` doesn't
pass `prmd verify`ication:

```console
$ git rev-parse HEAD
b4113feedf6fc504b315ed9ed2d1d69eb05fc54c

$ bundle exec bin/prmd init feel > ~/feel.json

$ bundle exec bin/prmd verify ~/feel.json
/Users/mmcgrana/feel.json: Missing `schema/feel#/description`
```

I think it would be nice if this did work. Would you be open to adding
a placeholder description in `init`'d schemas to achieve this?