- add content.txt for a brief description of the source files
- add TodoList.txt to list change that need to be done
- add several files needed to perform quaternionic color image manipulations as described
in "Denis, P., Carre, P., & Fernandez-Maloigne, C., Spatial and spectral quaternionic approaches for colour images, Computer Vision and Image Understanding, 107(1), (2007), 74-87."