add local files again

src/Makefile

src/README

src/bitbuffer.c

src/bitbuffer.d

src/bitbuffer.h

src/bitbuffer.o

src/calc_compression.c

src/calc_compression.h

src/codebook.c

src/codebook.d

src/codebook.h

src/codebook.o

src/distribution.c

src/distribution.d

src/distribution.h

src/distribution.o

src/huffman-main.c

src/huffman-main.d

src/huffman-main.o

src/huffman.c