Add tasks for all the new languages

Task/Least-common-multiple/ERRE/least-common-multiple.erre

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+PROGRAM LCM
+
+PROCEDURE GCD(A,B->GCD)
+    LOCAL C
+    WHILE B DO
+        C=A
+        A=B
+        B=C MOD B
+    END WHILE
+    GCD=ABS(A)
+END PROCEDURE
+
+PROCEDURE LCM(M,N->LCM)
+    IF M=0 OR N=0 THEN
+        LCM=0
+        EXIT PROCEDURE
+      ELSE
+        GCD(M,N->GCD)
+        LCM=ABS(M*N)/GCD
+    END IF
+END PROCEDURE
+
+BEGIN
+    LCM(18,12->LCM)
+    PRINT("LCM of 18 AND 12 =";LCM)
+    LCM(14,-6->LCM)
+    PRINT("LCM of 14 AND -6 =";LCM)
+    LCM(0,35->LCM)
+    PRINT("LCM of 0 AND 35 =";LCM)
+END PROGRAM