Add getter for global origin of map (#20)

* Add getter for global origin of map

This commit adds a getter for the global origin of the map

* Fix format

Author: Jaeyoung-Lim

include/grid_map_geo/grid_map_geo.h

@@ -77,6 +77,17 @@ class GridMapGeo {
    */
   void setGlobalOrigin(ESPG src_coord, const Eigen::Vector3d origin);
 
+  /**
+   * @brief Get the Global Origin object
+   *
+   * @param src_coord
+   * @param origin
+   */
+  void getGlobalOrigin(ESPG& src_coord, Eigen::Vector3d& origin) {
+    src_coord = localorigin_wgs84_.espg;
+    origin = localorigin_wgs84_.position;
+  };
+
   /**
    * @brief Set the Altitude Origin object
    *