Oauth2.0 Client Credentials method

[Hvuj]

Tell us about the documentation you'd like us to add or update.

Please add complete documentation for authentication methods available and their types and how to use them and what is required to make custom authentication if airbytes classes are being used in some way i.e. mixing airbytes classes with some custom logic.

If applicable, add links to the relevant docs that should be updated

There are none at the moment