Add stub algorithm to control car with lidar

persontracking/algorithms.py

@@ -105,3 +105,11 @@ def assign_groups(prev_groups, new_groups):
                 new_group.set_number(group.get_number())
 
     return new_groups
+
+def updateCarVelocity(oldGroup, newGroup):
+    '''
+    Return a tuple (throttleChange, steeringChange) that should be
+    applied given the change in the centre of the groups. 
+    '''
+    
+    pass