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feat: add swift implementation to lcof problem: No.04 (doocs#2830)

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`@@ -224,6 +224,21 @@ public class Solution {`
`224`	`224`	`}`
`225`	`225`	```
`226`	`226`
	`227`	`+#### Swift`
	`228`	`+`
	`229`	+```swift
	`230`	`+class Solution {`
	`231`	`+ func findNumberIn2DArray(_ matrix: [[Int]], _ target: Int) -> Bool {`
	`232`	`+ for row in matrix {`
	`233`	`+ if let _ = row.firstIndex(of: target) {`
	`234`	`+ return true`
	`235`	`+ }`
	`236`	`+ }`
	`237`	`+ return false`
	`238`	`+ }`
	`239`	`+}`
	`240`	+```
	`241`	`+`
`227`	`242`	`<!-- tabs:end -->`
`228`	`243`
`229`	`244`	`<!-- solution:end -->`

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`@@ -0,0 +1,10 @@`
	`1`	`+class Solution {`
	`2`	`+ func findNumberIn2DArray(_ matrix: [[Int]], _ target: Int) -> Bool {`
	`3`	`+ for row in matrix {`
	`4`	`+ if let _ = row.firstIndex(of: target) {`
	`5`	`+ return true`
	`6`	`+ }`
	`7`	`+ }`
	`8`	`+ return false`
	`9`	`+ }`
	`10`	`+}`

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