Merge pull request #4456 from sparr/add_topic_factorio

Add Factorio topic

Author: tomthorogood

topics/factorio/factorio.png

@@ -0,0 +1,12 @@
+---
+created_by: Wube Software
+display_name: Factorio
+logo: factorio.png
+github_url: https://github.com/wube
+short_description: Factorio is a game of building factories on an alien planet.
+released: August 14, 2020
+url: https://www.factorio.com/
+topic: factorio
+wikipedia_url: https://en.wikipedia.org/wiki/Factorio
+---
+Factorio is a 2d game in which the player explores an alien planet, mines resources, builds structures, moves resources using machines, conveyor belts, trains, and other methods, fights enemies, and tries to launch a rocket to space. The game supports mods written using Lua.