Add `add` alias for `shelly config create`

[#64513130]
Add `new` and `create` aliases for `shelly user add`

[#64513130]
Add `new` alias for `shelly backup create`

[#64513130]
Add `new` and `create` aliases for `shelly organization add`

[#64513130]
Merge pull request #123 from shellycloud/add-alias-for-create

Add aliases to shelly gem