add: N-Queen Backtrack solution #613
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N-queens(Leetcode) JAVA Solution. #515
Added Backtracking solution for N-queens problem of Leetcode.
accepted on leetcode :
Runtime: 9 ms, faster than 44.45% of Java online submissions for N-Queens.
Memory Usage: 46.5 MB, less than 27.44% of Java online submissions for N-Queens.