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添加 0700.二叉搜索树中的搜索.md Scala版本

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`@@ -363,7 +363,34 @@ function searchBST(root: TreeNode \| null, val: number): TreeNode \| null {`
`363`	`363`	`};`
`364`	`364`	```
`365`	`365`
	`366`	`+## Scala`
	`367`	`+`
	`368`	`+递归:`
	`369`	+```scala
	`370`	`+object Solution {`
	`371`	`+ def searchBST(root: TreeNode, value: Int): TreeNode = {`
	`372`	`+ if (root == null \|\| value == root.value) return root`
	`373`	`+ // 相当于三元表达式,在Scala中if...else有返回值`
	`374`	`+ if (value < root.value) searchBST(root.left, value) else searchBST(root.right, value)`
	`375`	`+ }`
	`376`	`+}`
	`377`	+```
`366`	`378`
	`379`	`+迭代:`
	`380`	+```scala
	`381`	`+object Solution {`
	`382`	`+ def searchBST(root: TreeNode, value: Int): TreeNode = {`
	`383`	`+ // 因为root是不可变量,所以需要赋值给一个可变量`
	`384`	`+ var node = root`
	`385`	`+ while (node != null) {`
	`386`	`+ if (value < node.value) node = node.left`
	`387`	`+ else if (value > node.value) node = node.right`
	`388`	`+ else return node`
	`389`	`+ }`
	`390`	`+ null // 没有返回就返回空`
	`391`	`+ }`
	`392`	`+}`
	`393`	+```
`367`	`394`
`368`	`395`	`-----------------------`
`369`	`396`	`<div align="center"><img src=https://code-thinking.cdn.bcebos.com/pics/01二维码一.jpg width=500> </img></div>`

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