Add example code for CMIS 1.1 Type Mutability - type creation

Currently there are no examples (that I can find anyway) of how to
create new types (and corresponding property types), choice lists, etc., using the CMIS 1.1 type mutability feature.

I have written a (generic) Java command-line example that
has no dependencies other than OpenCMIS. This sample code
creates a sub-type of cmis:document with 4 new properties (one of each

{ Integer, Boolean, Id and String }

and an associated choice list for the
String. (checking first that these are creatable property types)

The code is a few hundred lines long but is very simple to follow and I
believe would make a good addition to the
http://chemistry.apache.org/java/examples/index.html
(examples) section.