Add Browser Binding Service Classes

Summary:
Add CMIS Services for the Browser Binding.
In this step only the classes and the required methods
are added. Implementation will follow in a later step when
the service is required.

Reviewers: claus.due, #forgetit-dev

Reviewed By: claus.due, #forgetit-dev

Differential Revision: https://phabricator.dkd.de/D372