Writting documentation on CSR segments.

Documentation/Examples/Algorithms/Segments/CMakeLists.txt

...s/Algorithms/Segments/SegmentsExample_CSR_forElements.cpp

...es/Algorithms/Segments/SegmentsExample_CSR_forElements.cu

...s/Algorithms/Segments/SegmentsExample_CSR_forSegments.cpp

...es/Algorithms/Segments/SegmentsExample_CSR_forSegments.cu

...lgorithms/Segments/SegmentsExample_CSR_reduceSegments.cpp

...Algorithms/Segments/SegmentsExample_CSR_reduceSegments.cu

...ms/Segments/SegmentsExample_CSR_sequentialForSegments.cpp

...hms/Segments/SegmentsExample_CSR_sequentialForSegments.cu

src/TNL/Algorithms/Segments/CSR.h

src/TNL/Algorithms/Segments/SegmentElement.h

src/TNL/Algorithms/Segments/SegmentView.h

src/TNL/Algorithms/Segments/SegmentViewIterator.h