Add tasks for all the new languages

Task/Parsing-RPN-calculator-algorithm/Sidef/parsing-rpn-calculator-algorithm.sidef

@@ -0,0 +1,33 @@
+var proggie = '3 4 2 * 1 5 - 2 3 ^ ^ / +';
+
+class RPN(arr=[]) {
+
+    method binop(op) {
+        var x = arr.pop
+        var y = arr.pop
+        arr << y.(op)(x)
+    }
+
+    method run(p) {
+        p.each_word { |w|
+            say "#{w} (#{arr})";
+            given (w) {
+                when (/\d/) {
+                    arr << w.to_f
+                }
+                when (<+ - * />) {
+                    self.binop(w)
+                }
+                when ('^') {
+                    self.binop('**')
+                }
+                default {
+                    die "#{w} is bogus"
+                }
+            }
+        }
+        say arr[0]
+    }
+}
+
+RPN.new.run(proggie);