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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`	`+functionexponentialFunction(power,n){`
	`10`	`+letoutput=0`
	`11`	`+letfac=1`
	`12`	`+if(isNaN(power)\|\|isNaN(n)\|\|n<0){`
	`13`	`+thrownewTypeError('Invalid Input')`
	`14`	`+}`
	`15`	`+if(n===0){return1}`
	`16`	`+for(leti=0;i<n;i++){`
	`17`	`+output+=(power**i)/fac`
	`18`	`+fac*=(i+1)`
	`19`	`+}`
	`20`	`+returnoutput`
	`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(typeofexponentialFunction).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`	`+constex=exponentialFunction(5,20)`
	`14`	`+expect(ex).toBe(148.4131078683383)`
	`15`	`+})`
	`16`	`+})`

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