Add tasks for all the new languages

Task/Ethiopian-multiplication/Swift/ethiopian-multiplication.swift

@@ -0,0 +1,26 @@
+import Darwin
+
+func ethiopian(var #int1:Int, var #int2:Int) -> Int {
+  var lhs = [int1], rhs = [int2]
+
+  func isEven(#n:Int) -> Bool {return n % 2 == 0}
+  func double(#n:Int) -> Int {return n * 2}
+  func halve(#n:Int) -> Int {return n / 2}
+
+  while int1 != 1 {
+    lhs.append(halve(n: int1))
+    rhs.append(double(n: int2))
+    int1 = halve(n: int1)
+    int2 = double(n: int2)
+  }
+
+  var returnInt = 0
+  for (a,b) in zip(lhs, rhs) {
+    if (!isEven(n: a)) {
+      returnInt += b
+    }
+  }
+  return returnInt
+}
+
+println(ethiopian(int1: 17, int2: 34))