Support for Kerberos authentication?

[vinayak1986]

Hello,

Thanks to the maintainers for this awesome package. I was wondering if there are any plans for integrating Kerberos as an authentication provider for Office365? I had a requirement at work to integrate with a Sharepoint on-premises instance that supports only Kerberos & NTLM authentication methods, and they are leaning towards using Kerberos. I was able to get the codebase to do this by adding Kerberos to the providers module and then by calling it from the sharepoint module. Can I create a PR for this? Thanks again!