Add tasks for all the new languages

Task/Classes/ERRE/classes.erre

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+PROGRAM CLASS2_DEMO
+
+CLASS QUADRATO
+
+    LOCAL LATO
+
+    PROCEDURE GETLATO(L)
+       LATO=L
+    END PROCEDURE
+
+    PROCEDURE AREA(->A)
+       A=LATO*LATO
+    END PROCEDURE
+
+    PROCEDURE PERIMETRO(->P)
+       P=4*LATO
+    END PROCEDURE
+
+END CLASS
+
+NEW P:QUADRATO,Q:QUADRATO
+
+BEGIN
+    P_GETLATO(10)
+    P_AREA(->AREAP)
+    PRINT(AREAP)
+    Q_GETLATO(20)
+    Q_PERIMETRO(->PERIMETROQ)
+    PRINT(PERIMETROQ)
+END PROGRAM