There's not a whole lot you can do other than a blank template or you'd just be getting into specifics of a particular level. But it's only about 1 or 2 lines changed from the multiplayer template, so it didn't seem too worth while to include both. Just use the multiplayer template and change the multiplayer game type to colony.
Topics such as AI are a little too involved to really get into a template. Even base layout doesn't really fit since most levels have differenty base layouts from other levels. Same with resources. If you want more than a blank template, than just make the same change above to an example level and make it a colony game.