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Merge pull requestneetcode-gh#152 from chandra9302/patch-9

Create 125_Valid_Palindrome.swift

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	`1`	`+/**`
	`2`	`+ * Question Link: https://leetcode.com/problems/valid-palindrome/`
	`3`	`+ */`
	`4`	`+`
	`5`	`+classValidPalindrome{`
	`6`	`+func isPalindrome(_ s:String)->Bool{`
	`7`	`+varl=0,r= s.count-1`
	`8`	`+letsChars=Array(s.lowercased())`
	`9`	`+`
	`10`	`+while l< r{`
	`11`	`+while !sChars[l].isAlphanumeric && l< r{`
	`12`	`+ l+=1`
	`13`	`+}`
	`14`	`+`
	`15`	`+while !sChars[r].isAlphanumeric && l< r{`
	`16`	`+ r-=1`
	`17`	`+}`
	`18`	`+`
	`19`	`+ifsChars[l]!=sChars[r]{`
	`20`	`+returnfalse`
	`21`	`+}else{`
	`22`	`+ l+=1`
	`23`	`+ r-=1`
	`24`	`+}`
	`25`	`+}`
	`26`	`+returntrue`
	`27`	`+}`
	`28`	`+}`
	`29`	`+`
	`30`	`+extensionCharacter{`
	`31`	`+varisAlphanumeric:Bool{`
	`32`	`+return isLetter \|\| isNumber`
	`33`	`+}`
	`34`	`+}`

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