Add tasks for all the new languages

Task/Exponentiation-operator/Nim/exponentiation-operator.nim

@@ -0,0 +1,23 @@
+proc `^`[T: float|int](base: T; exp: int): T =
+  var (base, exp) = (base, exp)
+  result = 1
+
+  if exp < 0:
+    when T is int:
+      if base * base != 1: return 0
+      elif (exp and 1) == 0: return 1
+      else: return base
+    else:
+      base = 1.0 / base
+      exp = -exp
+
+  while exp != 0:
+    if (exp and 1) != 0:
+      result *= base
+    exp = exp shr 1
+    base *= base
+
+echo "2^6 = ", 2^6
+echo "2^-6 = ", 2 ^ -6
+echo "2.71^6 = ", 2.71^6
+echo "2.71^-6 = ", 2.71 ^ -6