Add Reversing A List - Part 2 as an elixir til

elixir/reversing-a-list-part-2.md

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+# Reversing A List - Part 2
+
+In [Reversing A List](reversing-a-list.md), I showed how Erlang's
+`:lists.reverse()` function could be used to reverse a list. Since then,
+Elixir now has a built-in function for reversing lists. In fact, it works
+with anything that implements the `Enumerable` protocol.
+
+```elixir
+> Enum.reverse([1,2,3,4,5])
+[5, 4, 3, 2, 1]
+> Enum.reverse(%{a: 1, b: 2, c: 3})
+[c: 3, b: 2, a: 1]
+```