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chore: Merge pull request #726 from ahamed/master

✨ add an algorithm for checking a year is a leap year or not.

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`156`	`156`	`* [IsDivisible](https://github.com/TheAlgorithms/Javascript/blob/master/Maths/IsDivisible.js)`
`157`	`157`	`* [IsEven](https://github.com/TheAlgorithms/Javascript/blob/master/Maths/IsEven.js)`
`158`	`158`	`* [isOdd](https://github.com/TheAlgorithms/Javascript/blob/master/Maths/isOdd.js)`
	`159`	`+ * [LeapYear](https://github.com/TheAlgorithms/Javascript/blob/master/Maths/LeapYear.js)`
`159`	`160`	`* [Mandelbrot](https://github.com/TheAlgorithms/Javascript/blob/master/Maths/Mandelbrot.js)`
`160`	`161`	`* [MatrixExponentiationRecursive](https://github.com/TheAlgorithms/Javascript/blob/master/Maths/MatrixExponentiationRecursive.js)`
`161`	`162`	`* [MatrixMultiplication](https://github.com/TheAlgorithms/Javascript/blob/master/Maths/MatrixMultiplication.js)`

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	`1`	`+/**`
	`2`	`+ * isLeapYear :: Number -> Boolean`
	`3`	`+ *`
	`4`	`+ * Check if a year is a leap year or not. A leap year is a year which has 366 days.`
	`5`	`+ * For the extra +1 day the February month contains 29 days instead of 28 days.`
	`6`	`+ *`
	`7`	`+ * The logic behind the leap year is-`
	`8`	`+ * 1. If the year is divisible by 400 then it is a leap year.`
	`9`	`+ * 2. If it is not divisible by 400 but divisible by 100 then it is not a leap year.`
	`10`	`+ * 3. If the year is not divisible by 400 but not divisible by 100 and divisible by 4 then a leap year.`
	`11`	`+ * 4. Other cases except the describing ones are not a leap year.`
	`12`	`+ *`
	`13`	`+ * @param {number} year`
	`14`	`+ * @returns {boolean} true if this is a leap year, false otherwise.`
	`15`	`+ */`
	`16`	`+export const isLeapYear = (year) => {`
	`17`	`+ if (year % 400 === 0) return true`
	`18`	`+ if (year % 100 === 0) return false`
	`19`	`+ if (year % 4 === 0) return true`
	`20`	`+`
	`21`	`+ return false`
	`22`	`+}`

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	`1`	`+import { isLeapYear } from '../LeapYear'`
	`2`	`+`
	`3`	`+describe('Leap Year', () => {`
	`4`	`+ it('Should return true on the year 2000', () => {`
	`5`	`+ expect(isLeapYear(2000)).toBe(true)`
	`6`	`+ })`
	`7`	`+ it('Should return false on the year 2001', () => {`
	`8`	`+ expect(isLeapYear(2001)).toBe(false)`
	`9`	`+ })`
	`10`	`+ it('Should return false on the year 2002', () => {`
	`11`	`+ expect(isLeapYear(2002)).toBe(false)`
	`12`	`+ })`
	`13`	`+ it('Should return false on the year 2003', () => {`
	`14`	`+ expect(isLeapYear(2003)).toBe(false)`
	`15`	`+ })`
	`16`	`+ it('Should return false on the year 2004', () => {`
	`17`	`+ expect(isLeapYear(2004)).toBe(true)`
	`18`	`+ })`
	`19`	`+ it('Should return false on the year 1900', () => {`
	`20`	`+ expect(isLeapYear(1900)).toBe(false)`
	`21`	`+ })`
	`22`	`+})`

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