add brute force search

[jenavarrob]

to implement brute force function, as in going over all possible combinations and test them. Probably the function needs a stopping rule to avoid getting stuck on a nearly endless loop, for example for N>10. Goal is to implement then following function on utils:

static public int[] findStableMatchesUsingBruteForce(int[,] menPrefs, int[,] womenPrefs)