finish hw 1
add hw 2
rename hw dirs
add assignment details
finish 2.1 hw
start hw 2.2
start hw 2.2.3
add week 3 hw
finish week2 hw
add assignment 3 docs
hw 3.1-3
finish hw 3
add week 4
finish up to singleton of huffman construction
finish hw4 construction
start decoding
finish hw 4