Missing project files

[Poikilos]

If you add missing Blender project files (or whatever project files you used), that will assist me in improving the Giant Rat (dmobs_rat), and help other people contribute as well. You could add a "src" directory to the root of the repo to contain all project files. The minetest.net API documentation seems do indicate that the engine does not transfer nonstandard directories to the client, so adding such a directory should not increase network traffic. If it does, it could be deleted in releases and noted in the readme.