Add tasks for all the new languages

Task/Ethiopian-multiplication/Powerbuilder/ethiopian-multiplication.powerbuilder

@@ -0,0 +1,28 @@
+public function boolean wf_iseven (long al_arg);return mod(al_arg, 2 ) = 0
+end function
+
+public function long wf_halve (long al_arg);RETURN int(al_arg / 2)
+end function
+
+public function long wf_double (long al_arg);RETURN al_arg * 2
+end function
+
+public function long wf_ethiopianmultiplication (long al_multiplicand, long al_multiplier);// calculate result
+long ll_product
+
+DO WHILE al_multiplicand >= 1
+	IF wf_iseven(al_multiplicand) THEN
+		// do nothing
+	ELSE
+		ll_product += al_multiplier
+	END IF
+	al_multiplicand = wf_halve(al_multiplicand)
+	al_multiplier = wf_double(al_multiplier)
+LOOP
+
+return ll_product
+end function
+
+// example call
+long ll_answer
+ll_answer = wf_ethiopianmultiplication(17,34)