added orb_slam2 package

navigation_layer/orb_slam2/KeyFrameTrajectory.txt

@@ -0,0 +1,31 @@
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navigation_layer/orb_slam2/cat/.catkin_workspace

@@ -0,0 +1 @@
+# This file currently only serves to mark the location of a catkin workspace for tool integration

navigation_layer/orb_slam2/cat/src/CMakeLists.txt

@@ -0,0 +1 @@
+/opt/ros/kinetic/share/catkin/cmake/toplevel.cmake