Missing packaging

[rubenwardy]

• Please add a mod.conf file with a name, list of dependencies, and a description
• Please also provide a screenshot.png

Example mod.conf:

name = basic_robot
depends = default
description = A lightweight programmable robot for multiplayer. Write programs in Lua - robot can move around, sense the blocks and build/dig. 

also, is there a min minetest version? In which case, add min_minetest_version = 5.2 to mod.conf, for example