Add lesson on computer vision

README.md

etc/CONTRIBUTING.md

lessons/4-ComputerVision/06-IntroCV/OpenCV.ipynb

lessons/4-ComputerVision/06-IntroCV/README.md

lessons/4-ComputerVision/06-IntroCV/data/braille.jpeg

lessons/4-ComputerVision/06-IntroCV/data/motionvideo.mp4

...ons/4-ComputerVision/06-IntroCV/images/braille-result.png

...ns/4-ComputerVision/06-IntroCV/images/braille-symbols.png

...s/4-ComputerVision/06-IntroCV/images/frame-difference.png

lessons/4-ComputerVision/06-IntroCV/images/optical.png

lessons/4-ComputerVision/06-IntroCV/images/palm-movement.png

...s/4-ComputerVision/06-IntroCV/lab/MovementDetection.ipynb

lessons/4-ComputerVision/06-IntroCV/lab/README.md

lessons/4-ComputerVision/06-IntroCV/lab/palm-movement.mp4

lessons/4-ComputerVision/07-ConvNets/README.md

lessons/4-ComputerVision/README.md