Adding manhattan-distance

src/algorithms/math/manhattan-distance/README.md

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+This math algorithm is to calculate the manhattan distance with 4 variable key in by user
+
+Point 1 (x[i], y[i])
+Point 2 (x[j], y[j])
+
+Then they will perform this calculation
+(Math.abs(x[i] - x[j]) + Math.abs(y[i] - y[j]))
+
+To obtain the result

src/algorithms/math/manhattan-distance/__test__/manhattanDistance.test.js

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+import manhattanDistance from '../manhattanDistance';
+
+describe('manhattanDistance', () => {
+    it('should calculate the manhattan distance', () => {
+        expect(manhattanDistance(1,5,1,8)).toEqual(1);
+    })
+})

src/algorithms/math/manhattan-distance/manhattanDistance.js

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+//This function is calculate the manhattan distance
+/** 
+* @param {string} x
+* @param {string} y
+* @return {string}
+*/
+export default function manhattanDistance(x, y) {
+
+let SumOfManhattanDistance = 0;
+
+for (let i = 0; i < x.length; i++){
+	for (let j = 0; j < x[i].length ; j++){
+	//Compute the result of the Manhattan Distance
+	SumOfManhattanDistance += (Math.abs(x[i] - x[j]) + Math.abs(y[i] - y[j]));
+	}
+}
+//Send the result back to the main function
+return SumOfManhattanDistance; 
+}