feat: add Swift codes for hash_algorithm article (#576)

codes/swift/chapter_hashing/built_in_hash.swift

@@ -0,0 +1,37 @@
+/**
+ * File: built_in_hash.swift
+ * Created Time: 2023-07-01
+ * Author: nuomi1 (nuomi1@qq.com)
+ */
+
+import utils
+
+@main
+enum BuiltInHash {
+    /* Driver Code */
+    static func main() {
+        let num = 3
+        let hashNum = num.hashValue
+        print("整数 \(num) 的哈希值为 \(hashNum)")
+
+        let bol = true
+        let hashBol = bol.hashValue
+        print("布尔量 \(bol) 的哈希值为 \(hashBol)")
+
+        let dec = 3.14159
+        let hashDec = dec.hashValue
+        print("小数 \(dec) 的哈希值为 \(hashDec)")
+
+        let str = "Hello 算法"
+        let hashStr = str.hashValue
+        print("字符串 \(str) 的哈希值为 \(hashStr)")
+
+        let arr = [AnyHashable(12836), AnyHashable("小哈")]
+        let hashTup = arr.hashValue
+        print("数组 \(arr) 的哈希值为 \(hashTup)")
+
+        let obj = ListNode(x: 0)
+        let hashObj = obj.hashValue
+        print("节点对象 \(obj) 的哈希值为 \(hashObj)")
+    }
+}