gazebo port to noetic induced branch

stretch_gazebo/maps/willowgarage.yaml

@@ -0,0 +1,7 @@
+image: /home/ananya/Code/VZ_Project/Robot_Autonomous_Navigation/catkin_ws/src/stretch_ros/stretch_gazebo/maps/willowgarage.pgm
+resolution: 0.050000
+origin: [-100.000000, -100.000000, 0.000000]
+negate: 0
+occupied_thresh: 0.65
+free_thresh: 0.196
+

stretch_gazebo/worlds/willowgarageempty.world

@@ -0,0 +1,14 @@
+<?xml version="1.0" ?>
+<sdf version="1.5">
+  <world name="default">
+    <include>
+      <uri>model://ground_plane</uri>
+    </include>
+    <include>
+      <uri>model://sun</uri>
+    </include>
+    <include>
+      <uri>model://willowgarage</uri>
+    </include>
+  </world>
+</sdf>