add info about build scripts and README to instructions

Thanks @robert-vo!
make sure start branch is upstream/master for clean PRs no matter the state of user's origin/master
read in data
more compiled files to gitignore
utility function to parse rank string to integer
tests (using TAP)
update build
fix debugging
table to count the rank occurrence
update prob01-poker/zmughal
clean up sscanf: don't need parens
sorting
sort by suit too
remove DEBUG ifdefs
template for hand value
add readme
add hand_is_sequential function
rank_t to constant string array
identify hands
off by one in the table