Add missing exposure loop for 2018

Change-Id: I23a2ced4f4919533f9e9df8b7d8b86268cfece3c
diff --git a/y2018/vision/exposure_loop.sh b/y2018/vision/exposure_loop.sh
new file mode 100755
index 0000000..5fd2da5
--- /dev/null
+++ b/y2018/vision/exposure_loop.sh
@@ -0,0 +1,8 @@
+#!/bin/bash
+
+while true
+do
+  v4l2-ctl --set-ctrl="exposure_absolute=300" -d /dev/video0
+  v4l2-ctl --set-ctrl="exposure_absolute=300" -d /dev/video1
+  sleep 10
+done