* README.md: rm redundant file
Added files for exploration. Stubbed first hw function.
* hw1/homework1.sml: Stubbed homework functions
hw1 is_older complete - but messy
hw1 Q2 dates_in_month complete
hw1 Q3 number_in_month, Q4 numbers_in_month complete
hw1 Q4 dates_in_month complete
hw1 Q5 dates_in_months complete
hw1 Q6 get-nth complete
hw1 Q7 date_to_string complete
hw1 Q8 number_before_reaching_sum is complete
hw1 Q9 what_month is complete
hw1 tidied up Q1 is_older
hw1 tidied up Q1 is_older some more