add queen-attack solution
add palindrome first iteration
add first iteration of saddle points
add 2nd saddle iteration
add atbash solution 1st iteration
add house solution 1st iteration
add house solution 2nd iteration
add secret handshake 1st iteration
add matrix and triangle solutions
add secret handshake 2nd iteration
add secret handshake 3rd iteration
add ocr solution 1st iteration
add ocr solution 2nd iteration
add pig latin 1st iteration
add luhn solution 1st iteration
add wordy solution