Add tasks for all the new languages

Task/Sort-using-a-custom-comparator/Swift/sort-using-a-custom-comparator-1.swift

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+import Foundation
+
+var list = ["this",
+  "is",
+  "a",
+  "set",
+  "of",
+  "strings",
+  "to",
+  "sort",
+  "This",
+  "Is",
+  "A",
+  "Set",
+  "Of",
+  "Strings",
+  "To",
+  "Sort"]
+
+list.sortInPlace {lhs, rhs in
+  let lhsCount = lhs.characters.count
+  let rhsCount = rhs.characters.count
+  let result = rhsCount - lhsCount
+
+  if result == 0 {
+    return lhs.lowercaseString > rhs.lowercaseString
+  }
+
+  return lhsCount > rhsCount
+}

Task/Sort-using-a-custom-comparator/Swift/sort-using-a-custom-comparator-2.swift

@@ -0,0 +1,30 @@
+import Foundation
+
+var list = ["this",
+    "is",
+    "a",
+    "set",
+    "of",
+    "strings",
+    "to",
+    "sort",
+    "This",
+    "Is",
+    "A",
+    "Set",
+    "Of",
+    "Strings",
+    "To",
+    "Sort"]
+
+sort(&list) {lhs, rhs in
+    let lhsCount = count(lhs)
+    let rhsCount = count(rhs)
+    let result = rhsCount - lhsCount
+
+    if result == 0 {
+        return lhs.lowercaseString > rhs.lowercaseString
+    }
+
+    return lhsCount > rhsCount
+}