Add pointer to documentation.

Author: philip-lamb

readme.md

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+# ARToolKit Camera Calibration Applications
+
+This is a set of applications that allow the user to perform calibration of the intrinsic camera parameters for their device. The result can be saved as an ARToolKit camera calibration parameters file, or uploaded to an ARToolKit camera calibration server. This, along with the calibration server, and the runtime client component, constitute a system for distributed camera calibration generation and retrieval.
+
+## Why is this useful?
+Accurate knowledge of the intrinsic optical properties of the camera in an AR system is critical to robust tracking.
+
+## Documentation:
+
+See https://github.com/artoolkit/ar6-wiki/wiki
+
+Philip Lamb
+
+2017-09-28
+
+