Add tasks for all the new languages

Task/24-game/Swift/24-game.swift

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+import Darwin
+import Foundation
+
+println("24 Game")
+println("Generating 4 digits...")
+
+func randomDigits() -> Int[] {
+    var result = Int[]();
+    for var i = 0; i < 4; i++ {
+        result.append(Int(arc4random_uniform(9)+1))
+    }
+    return result;
+}
+
+// Choose 4 digits
+let digits = randomDigits()
+
+print("Make 24 using these digits : ")
+
+for digit in digits {
+    print("\(digit) ")
+}
+println()
+
+// get input from operator
+var input = NSString(data:NSFileHandle.fileHandleWithStandardInput().availableData, encoding:NSUTF8StringEncoding)
+
+var enteredDigits = Int[]()
+
+var enteredOperations = Character[]()
+
+let inputString = input as String
+
+// store input in the appropriate table
+for character in inputString {
+    switch character {
+        case "1", "2", "3", "4", "5", "6", "7", "8", "9":
+            let digit = String(character)
+            enteredDigits.append(digit.toInt()!)
+        case "+", "-", "*", "/":
+            enteredOperations.append(character)
+        case "\n":
+            println()
+        default:
+            println("Invalid expression")
+    }
+}
+
+// check value of expression provided by the operator
+var value = Int()
+
+if enteredDigits.count == 4 && enteredOperations.count == 3 {
+    value = enteredDigits[0]
+    for (i, operation) in enumerate(enteredOperations) {
+        switch operation {
+            case "+":
+                value = value + enteredDigits[i+1]
+            case "-":
+                value = value - enteredDigits[i+1]
+            case "*":
+                value = value * enteredDigits[i+1]
+            case "/":
+                value = value / enteredDigits[i+1]
+            default:
+                println("This message should never happen!")
+        }
+    }
+}
+
+if value != 24 {
+    println("The value of the provided expression is \(value) instead of 24!")
+} else {
+    println("Congratulations, you found a solution!")
+}