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添加剑指Offer58-II.左旋转字符串.md Scala版本

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Original file line number	Diff line number	Diff line change
`@@ -290,7 +290,34 @@ func reverseString(_ s: inout [Character], startIndex: Int, endIndex: Int) {`
`290`	`290`	`}`
`291`	`291`	```
`292`	`292`
`293`		`-`
	`293`	`+Scala:`
	`294`	`+`
	`295`	+```scala
	`296`	`+object Solution {`
	`297`	`+ def reverseLeftWords(s: String, n: Int): String = {`
	`298`	`+ var str = s.toCharArray // 转换为Array`
	`299`	`+ // abcdefg => ba cdefg`
	`300`	`+ reverseString(str, 0, n - 1)`
	`301`	`+ // ba cdefg => ba gfedc`
	`302`	`+ reverseString(str, n, str.length - 1)`
	`303`	`+ // ba gfedc => cdefgab`
	`304`	`+ reverseString(str, 0, str.length - 1)`
	`305`	`+ // 最终返回,return关键字可以省略`
	`306`	`+ new String(str)`
	`307`	`+ }`
	`308`	`+ // 翻转字符串`
	`309`	`+ def reverseString(s: Array[Char], start: Int, end: Int): Unit = {`
	`310`	`+ var (left, right) = (start, end)`
	`311`	`+ while (left < right) {`
	`312`	`+ var tmp = s(left)`
	`313`	`+ s(left) = s(right)`
	`314`	`+ s(right) = tmp`
	`315`	`+ left += 1`
	`316`	`+ right -= 1`
	`317`	`+ }`
	`318`	`+ }`
	`319`	`+}`
	`320`	+```
`294`	`321`
`295`	`322`
`296`	`323`

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