Added Readme.
Merge pull request #1 from jamiedarst/master

EDI 850 Java Object model
Merge pull request #2 from jamiedarst/master

missing classes
Moving source to the sub-module.
Refactored jaeb package structure to support sub-modules for EDI structures.
Refactored module names.
Refactored for multi-message.
Moved base objects.
Added get/set.
Renamed package.
Added in the edi810 document structure.
Added new fields to the segments.
Added fields for EDI 810.
Added getters/setters for all fields.
Added getters/setters for fields.
Added missing fields.
Completed model for x12 850
Completed model for x12 850
Added in the EDI 846.
Added in new object types to support more formats.