Add tasks for all the new languages

Task/Conditional-structures/Morfa/conditional-structures-4.morfa

@@ -0,0 +1,11 @@
+switch (num)
+    {
+        case (0)
+            { /* empty case requires braces */ }
+        case (1)
+            { var one = "one"; result = one; }
+        case (2,3) // case may contain a nonempty list of values
+            result = "a few";
+        default
+            result = "a lot";
+    }