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Merge pull requestneetcode-gh#316 from SharmaTushar1/patch-13

Create 852. Peak Index in a Mountain Array.java

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	`1`	`+//Use binary search`
	`2`	`+classSolution {`
	`3`	`+publicintpeakIndexInMountainArray(int[]arr) {`
	`4`	`+intstart =0;`
	`5`	`+intend =arr.length;`
	`6`	`+intn =arr.length;`
	`7`	`+while (start<=end) {`
	`8`	`+intmid =start+(end-start)/2;`
	`9`	`+if (mid!=0 &&mid!=n-1 &&arr[mid-1]<arr[mid] &&arr[mid+1]<arr[mid])`
	`10`	`+returnmid;`
	`11`	`+elseif (mid!=n-1 &&arr[mid+1]>arr[mid])`
	`12`	`+start =mid+1;`
	`13`	`+elseif (mid!=0 &&arr[mid-1]>arr[mid])`
	`14`	`+end =mid-1;`
	`15`	`+ }`
	`16`	`+returnend;`
	`17`	`+ }`
	`18`	`+}`

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