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Add an algorithm to find Taylor series approximation of exponential f... (TheAlgorithms#1160)

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	`1`	`+/**`
	`2`	`+ * @function exponentialFunction`
	`3`	`+ * @description Calculates the n+1 th order Taylor series approximation of exponential function e^x given n`
	`4`	`+ * @param {Integer} power`
	`5`	`+ * @param {Integer} order - 1`
	`6`	`+ * @returns exponentialFunction(2,20) = 7.3890560989301735`
	`7`	`+ * @url https://en.wikipedia.org/wiki/Exponential_function`
	`8`	`+ */`
	`9`	`+function exponentialFunction (power, n) {`
	`10`	`+ let output = 0`
	`11`	`+ let fac = 1`
	`12`	`+ if (isNaN(power) \|\| isNaN(n) \|\| n < 0) {`
	`13`	`+ throw new TypeError('Invalid Input')`
	`14`	`+ }`
	`15`	`+ if (n === 0) { return 1 }`
	`16`	`+ for (let i = 0; i < n; i++) {`
	`17`	`+ output += (power ** i) / fac`
	`18`	`+ fac *= (i + 1)`
	`19`	`+ }`
	`20`	`+ return output`
	`21`	`+}`
	`22`	`+`
	`23`	`+export {`
	`24`	`+ exponentialFunction`
	`25`	`+}`

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	`1`	`+import { exponentialFunction } from '../ExponentialFunction'`
	`2`	`+`
	`3`	`+describe('Tests for exponential function', () => {`
	`4`	`+ it('should be a function', () => {`
	`5`	`+ expect(typeof exponentialFunction).toEqual('function')`
	`6`	`+ })`
	`7`	`+`
	`8`	`+ it('should throw error for invalid input', () => {`
	`9`	`+ expect(() => exponentialFunction(2, -34)).toThrow()`
	`10`	`+ })`
	`11`	`+`
	`12`	`+ it('should return the exponential function of power of 5 and order of 21', () => {`
	`13`	`+ const ex = exponentialFunction(5, 20)`
	`14`	`+ expect(ex).toBe(148.4131078683383)`
	`15`	`+ })`
	`16`	`+})`

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