add file nav_msgs

nav_msgs/include/nav_msgs/GridCells.h

@@ -0,0 +1,28 @@
+// #an array of cells in a 2D grid
+// Header header
+// float32 cell_width
+// float32 cell_height
+// geometry_msgs/Point[] cells
+#ifndef GRID_CELLS_H
+#define GRID_CELLS_H
+
+#include <cstdint>
+#include <string>
+#include <vector>
+#include "std_msgs/Header.h"
+#include "geometry_msgs/Point.h"
+
+namespace nav_msgs
+{
+
+struct GridCells
+{
+    std_msgs::Header header;
+    float cell_width;
+    float cell_height;
+    std::vector<geometry_msgs::Point> cells;
+};
+
+}
+
+#endif //GRID_CELLS_H