start project with sidemenu and navigation

the aim of the project is to provide an IOS prototype
based on work from the online repo and added up with
native swift work.

The project aims at having a simple editor, where the user
can correct typos etc. in complex documents. Sharing will
be done using the iCloud drive.

The project is a proof of concept, to replace the current
android/ios viewers.

The document will be presented using the webkit (available
in both IOS and Android) and reusing the Javascripts from online.
Thereby having one set of files to handle user interface for online,
android and ios.

The sidebar is intented to be used similar to MUFFIN (notebook bar),
while the action is for save/print etc.

Change-Id: I307a70b87e6367de2d22c1360a3e9cfa53d373a9
Reviewed-on: https://gerrit.libreoffice.org/35376Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: jan iversen <jani@libreoffice.org>
Tested-by: jan iversen <jani@libreoffice.org>