feat: add swift implementation to lcci problem: No.17.16 (doocs#2803)

Author: klever34

lcci/17.16.The Masseuse/README.md

@@ -119,6 +119,24 @@ function massage(nums: number[]): number {
 }
 ```
 
+```swift
+class Solution {
+    func massage(_ nums: [Int]) -> Int {
+        var f = 0
+        var g = 0
+        
+        for x in nums {
+            let ff = g + x
+            let gg = max(f, g)
+            f = ff
+            g = gg
+        }
+        
+        return max(f, g)
+    }
+}
+```
+
 <!-- tabs:end -->
 
 <!-- end -->

lcci/17.16.The Masseuse/README_EN.md

@@ -116,6 +116,24 @@ function massage(nums: number[]): number {
 }
 ```
 
+```swift
+class Solution {
+    func massage(_ nums: [Int]) -> Int {
+        var f = 0
+        var g = 0
+        
+        for x in nums {
+            let ff = g + x
+            let gg = max(f, g)
+            f = ff
+            g = gg
+        }
+        
+        return max(f, g)
+    }
+}
+```
+
 <!-- tabs:end -->
 
 <!-- end -->

lcci/17.16.The Masseuse/Solution.swift

@@ -0,0 +1,15 @@
+class Solution {
+    func massage(_ nums: [Int]) -> Int {
+        var f = 0
+        var g = 0
+        
+        for x in nums {
+            let ff = g + x
+            let gg = max(f, g)
+            f = ff
+            g = gg
+        }
+        
+        return max(f, g)
+    }
+}