update compresslib/huffman.py

update imglib.py

update compresslib/adaptive_haffman.py

update README.md

update cli.py

create compresslib/lz78.py

create compresslib/lz77.py

update README.md

create imgtool.py

create imglib.py

create cli.py

update README.md

create compresslib/gilbert.py

create compresslib/bookstack.py

create compresslib/adaptive_haffman.py

create compresslib/shannon.py

create compresslib/fano.py

create compresslib/huffman.py