Add orx-boofcv readme (#105)

orx-boofcv/README.md

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+# orx-boofcv
+
+An extension that simplifies the use of the BoofCV computer vision
+library inside OPENRNDR.
+
+BoofCV is an open source library written from scratch for real-time
+computer vision. Its functionality covers a range of subjects,
+low-level image processing, camera calibration, feature detection/tracking,
+structure-from-motion, fiducial detection, and recognition.
+BoofCV has been released under an Apache 2.0 license for both
+academic and commercial use.
+
+Examples of what BoofCV offers can be found at
+[http://boofcv.org/](http://boofcv.org/)
+
+As BoofCV implements it's own data types for images, lines, points, etc.
+this addon provides some helper functions to convert them to OPENRNDR types:
+
+- Bindings: converts to and from `ColorBuffer`.
+- Drawing: allows directly drawing BoofCV line segments and other shapes.
+- Point conversion to and from `Vector2`.
+- Contour conversion from `BoofCV.Contour` to `Shape` and `ShapeContour`.
+- `ImageFlow` to `ColorBuffer` conversion.
+
+<!-- __demos__ -->