added duplicated header files to a legacy order

We can delete that folder as soon as we are sure we dont need them

legacy_header_files/sidewalk.h

@@ -0,0 +1,10 @@
+# pragma once
+# include <vector2d.h>
+
+// initialize map
+struct Sidewalk{
+  double length, width;
+  Vector2d* obstacles;  // array containing the position of each obstacle
+  int n_obstacles;  // number of obstacles
+  Sidewalk(double l, double w, int n, Vector2d* obs) : length(l), width(w), n_obstacles(n), obstacles(obs) {}
+};