add an option to allow using Windows integrated credentials to authenticate to Nextcloud server

If would be great to make the Nextcloud client able to use a users integrated Windows credentials to authenticate against Nextcloud server. As in a company most users are using Active Directory to authenticate, it would be great to use this tokens to authenticate against the Nextcloud Server. In combination with adding some command line configuration options, this could enable admins to roll out and set up the client on a client machine without having the user to set up his/her account manually.