Add dev instructions

networks/roads/road.py

@@ -0,0 +1,7 @@
+class Road:
+    def __init__(self, coordinates, road_type):
+        self.coordinates = coordinates # List of tuples (x1, y1, z1) in order
+        self.road_type = road_type 	# 'road', 'highway'
+
+    def place_roads(self):
+        pass