Add tasks for all the new languages

Task/Classes/XLISP/classes.xlisp

@@ -0,0 +1,19 @@
+(DEFINE-CLASS PROGRAMMING-LANGUAGE
+    (INSTANCE-VARIABLES NAME YEAR))
+
+(DEFINE-METHOD (PROGRAMMING-LANGUAGE 'INITIALIZE X)
+    (SETQ NAME X)
+    SELF)
+
+(DEFINE-METHOD (PROGRAMMING-LANGUAGE 'WAS-CREATED-IN X)
+    (SETQ YEAR X))
+
+(DEFINE-METHOD (PROGRAMMING-LANGUAGE 'DESCRIBE)
+    `(THE PROGRAMMING LANGUAGE ,NAME WAS CREATED IN ,YEAR))
+
+(DEFINE LISP (PROGRAMMING-LANGUAGE 'NEW 'LISP))
+
+(LISP 'WAS-CREATED-IN 1958)
+
+(DISPLAY (LISP 'DESCRIBE))
+(NEWLINE)