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feat: add swift implementation to lcof2 problem: No.072 (doocs#3305)

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lcof2/剑指 Offer II 072. 求平方根
- README.md
- Solution.swift

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`‎lcof2/剑指 Offer II 072. 求平方根/README.md‎`

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`@@ -160,6 +160,29 @@ public class Solution {`
`160`	`160`	`}`
`161`	`161`	```
`162`	`162`
	`163`	`+#### Swift`
	`164`	`+`
	`165`	+```swift
	`166`	`+class Solution {`
	`167`	`+ func mySqrt(_ x: Int) -> Int {`
	`168`	`+ if x == 0 {`
	`169`	`+ return 0`
	`170`	`+ }`
	`171`	`+ var left = 0`
	`172`	`+ var right = x`
	`173`	`+ while left < right {`
	`174`	`+ let mid = (left + right + 1) / 2`
	`175`	`+ if mid <= x / mid {`
	`176`	`+ left = mid`
	`177`	`+ } else {`
	`178`	`+ right = mid - 1`
	`179`	`+ }`
	`180`	`+ }`
	`181`	`+ return left`
	`182`	`+ }`
	`183`	`+}`
	`184`	+```
	`185`	`+`
`163`	`186`	`<!-- tabs:end -->`
`164`	`187`
`165`	`188`	`<!-- solution:end -->`

`‎lcof2/剑指 Offer II 072. 求平方根/Solution.swift‎`

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`@@ -0,0 +1,18 @@`
	`1`	`+class Solution {`
	`2`	`+ func mySqrt(_ x: Int) -> Int {`
	`3`	`+ if x == 0 {`
	`4`	`+ return 0`
	`5`	`+ }`
	`6`	`+ var left = 0`
	`7`	`+ var right = x`
	`8`	`+ while left < right {`
	`9`	`+ let mid = (left + right + 1) / 2`
	`10`	`+ if mid <= x / mid {`
	`11`	`+ left = mid`
	`12`	`+ } else {`
	`13`	`+ right = mid - 1`
	`14`	`+ }`
	`15`	`+ }`
	`16`	`+ return left`
	`17`	`+ }`
	`18`	`+}`

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