Add support for automization via CLI

[kamellemann]

It would be great to use your solution with commadline to support automization.
Authentification via User / Service Principal with certificate or secret would be great.

Commandlets:
order-certificate
revokce-certificate
renew-certificate
get-dnszones
get-certificates

[kamellemann]

@shibayan Is there a way to call [AddCertificate_HttpStart] via http request to request a new certificate. Authentification can be done via MSI in Logic App.

[shibayan]

See it https://github.com/shibayan/keyvault-acmebot/wiki/Authentication-Methods-for-REST-API

[kamellemann]

Great, thanks!