Merge branch 'doc' into 'master'

doc to create_hash_map

See merge request mhart/DancingDroids!44

src/main.rs

@@ -41,6 +41,7 @@ fn check_collisions(r: &robot::Robot, h: &HashMap<robot::Position, u32>) -> Resu
     }
 }
 
+/// Creates HashMap of robot position and it's id.
 fn create_hash_map(pool: &Vec<robot::Robot>, hash: &mut HashMap<robot::Position, u32>) {
     for r in pool {
         hash.insert(robot::Position { x: r.p.x, y: r.p.y }, r.id);