Add base version of the map

[nvs]

Basically a clean *.w3x map file that can be used to build the latest version of the map. Initially this should be equivalent to what is offered in v3.1. This will be referenced in #20 as part of the build process. Release that this is not a full release of the map, but a shell without the JASS script included. For the corresponding v3.1 JASS script (war3map.j) see da039f8.

Later versions will be released as well, but infrequently. Changes will be documented with a specific label (particuarly the Area: Map label added in #27), to keep from adding too many binary files to the repository. Also, a file to document these changes will be created (see #28).

But for the most part the *.w3x map file will remain external to the repository.