🎉 feat: initial commit for leetcode 338 using Swift

Author: liuchuo

Swift/338. Counting Bits.swift

@@ -0,0 +1,11 @@
+// 338. Counting Bits
+// 28ms
+func countBits(_ num: Int) -> [Int] {
+    var arr = Array(repeating: 0, count: num+1), i = 0
+    while i <= num {
+        arr[i] = i.nonzeroBitCount
+        i += 1
+    }
+
+    return arr
+}