Add tasks for all the new languages

Task/Exponentiation-operator/Sidef/exponentiation-operator-1.sidef

@@ -0,0 +1,20 @@
+func expon(_, {.is_zero}) { 1 }
+
+func expon(base, exp {.is_neg}) {
+    expon(1/base, -exp)
+}
+
+func expon(base, exp {.is_int}) {
+
+  var c = 1
+  while (exp > 1) {
+    c *= base if exp.is_odd
+    base *= base
+    exp >>= 1
+  }
+
+  return (base * c)
+}
+
+say expon(3, 10)
+say expon(5.5, -3)

Task/Exponentiation-operator/Sidef/exponentiation-operator-2.sidef

@@ -0,0 +1,8 @@
+class Number {
+    method ⊙(exp) {
+        expon(self, exp)
+    }
+}
+
+say (3 ⊙ 10)
+say (5.5 ⊙ -3)