This is the in-game Hunter shelter (minus deco) made to work as a residential house. Has room for three citizens, and relatively bad living quality (-10) and pregnancy chance (12%) ‒ but it’s quick to build and does not need a lot of resources.
Available with the other houses, with a Hospital icon ( = house with a small plus sign). Food and firewood do show up (you can see the firewood on the first screenhot, behind the villager, if you look closely), but the food will often clip into the ground / be buried unless you build it on really flat terrain.
Updated for 0.9.6127.