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feat: add swift implementation to lcof2 problem: No.041 (doocs#3051)

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`@@ -172,6 +172,36 @@ func (this *MovingAverage) Next(val int) float64 {`
`172`	`172`	`*/`
`173`	`173`	```
`174`	`174`
	`175`	`+#### Swift`
	`176`	`+`
	`177`	+```swift
	`178`	`+class MovingAverage {`
	`179`	`+ private var arr: [Int]`
	`180`	`+ private var s: Int`
	`181`	`+ private var cnt: Int`
	`182`	`+`
	`183`	`+ init(_ size: Int) {`
	`184`	`+ arr = [Int](repeating: 0, count: size)`
	`185`	`+ s = 0`
	`186`	`+ cnt = 0`
	`187`	`+ }`
	`188`	`+`
	`189`	`+ func next(_ val: Int) -> Double {`
	`190`	`+ let idx = cnt % arr.count`
	`191`	`+ s += val - arr[idx]`
	`192`	`+ arr[idx] = val`
	`193`	`+ cnt += 1`
	`194`	`+ return Double(s) / Double(min(cnt, arr.count))`
	`195`	`+ }`
	`196`	`+}`
	`197`	`+`
	`198`	`+/**`
	`199`	`+ * Your MovingAverage object will be instantiated and called as such:`
	`200`	`+ * let obj = MovingAverage(size)`
	`201`	`+ * let param_1 = obj.next(val)`
	`202`	`+ */`
	`203`	+```
	`204`	`+`
`175`	`205`	`<!-- tabs:end -->`
`176`	`206`
`177`	`207`	`<!-- solution:end -->`

Lines changed: 25 additions & 0 deletions

Original file line number	Diff line number	Diff line change
`@@ -0,0 +1,25 @@`
	`1`	`+class MovingAverage {`
	`2`	`+ private var arr: [Int]`
	`3`	`+ private var s: Int`
	`4`	`+ private var cnt: Int`
	`5`	`+`
	`6`	`+ init(_ size: Int) {`
	`7`	`+ arr = [Int](repeating: 0, count: size)`
	`8`	`+ s = 0`
	`9`	`+ cnt = 0`
	`10`	`+ }`
	`11`	`+`
	`12`	`+ func next(_ val: Int) -> Double {`
	`13`	`+ let idx = cnt % arr.count`
	`14`	`+ s += val - arr[idx]`
	`15`	`+ arr[idx] = val`
	`16`	`+ cnt += 1`
	`17`	`+ return Double(s) / Double(min(cnt, arr.count))`
	`18`	`+ }`
	`19`	`+}`
	`20`	`+`
	`21`	`+/**`
	`22`	`+ * Your MovingAverage object will be instantiated and called as such:`
	`23`	`+ * let obj = MovingAverage(size)`
	`24`	`+ * let param_1 = obj.next(val)`
	`25`	`+ */`

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