Add tasks for all the new languages

Task/Assertions/Swift/assertions.swift

@@ -0,0 +1,6 @@
+var a = 5
+//...input or change a here
+assert(a == 42) // aborts program when a is not 42
+assert(a == 42, "Error message") // aborts program
+       // when a is not 42 with "Error message" for the message
+       // the error message must be a static string