Added ar_detector launch and rviz config files

launch/adc_ar_detector.launch

+<?xml version="1.0" encoding="UTF-8"?>
+<launch>
+  <arg name="car_name"  default="adc_car"/>
+
+  <node name="ar_track_alvar" 
+        pkg="ar_track_alvar" 
+        type="individualMarkersNoKinect" 
+        respawn="false" 
+        output="screen">
+    <param name="marker_size"           type="double" value="5.0" />
+    <param name="max_new_marker_error"  type="double" value="0.08" />
+    <param name="max_track_error"       type="double" value="0.2" />
+    <param name="output_frame"          type="string" value="$(arg car_name)/front_camera_uvc_camera_optical" />
+    <remap from="/camera_image"  to="$(arg car_name)/sensors/basler_camera/image_raw" />
+    <remap from="/camera_info"   to="$(arg car_name)/sensors/basler_camera/camera_info" />
+  </node>
+</launch>