Initial commit
Added permutations.fs first attempt
Calculate Primes.
Added logic.fs
Handles and/or and gives steps.
Permutations improved

permutations.fs now uses List.collect to avoid the need to flatten the
list so the code is now terser. Added a sanity check too.
Primes

Improved the implementation using tail-recursion. It is somewhat quicker
than before but more importantly it no longer causes
"OutOfMemoryException" for large N.
Powerset

Small program to print to screen and file the powerset of a given list.
Program for checking if a string contains properly matched and nested brackets.