Two Sum

	/**
	 * Given an array of integers, find two numbers such that they add up
to a
	 * specific target number.
	 * 
	 * The function twoSum should return indices of the two numbers such
that
	 * they add up to the target, where index1 must be less than index2.
Please
	 * note that your returned answers (both index1 and index2) are not
	 * zero-based.
	 * 
	 * You may assume that each input would have exactly one solution.
	 * 
	 * Input: numbers={2, 7, 11, 15}, target=9 Output: index1=1, index2=2
	 * 
	 * */