update readme et finalisation de certaines classes

README.md

src/ArbreB/Graph.gv

src/ArbreB/Graph.gv.jpg

src/ArbreB/Graph.gv.pdf

src/ArbreB/GraphPb.gv.jpg

src/BTree.py

src/Node.py

src/Visualization.py

src/__pycache__/BTree.cpython-310.pyc

src/__pycache__/Node.cpython-310.pyc

src/__pycache__/Visualization.cpython-310.pyc

src/__pycache__/util.cpython-310.pyc

src/experimentation.py

src/util.py