Add tasks for all the new languages

Task/Associative-array-Creation/Swift/associative-array-creation.swift

@@ -0,0 +1,13 @@
+// make an empty map
+var a = [String: Int]()
+// or
+var b: [String: Int] = [:]
+
+// make an empty map with an initial capacity
+var c = [String: Int](minimumCapacity: 42)
+
+// set a value
+c["foo"] = 3
+
+// make a map with a literal
+var d = ["foo": 2, "bar": 42, "baz": -1]