Add Create A List Of Atoms as an elixir til

elixir/create-a-list-of-atoms.md

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+# Create A List Of Atoms
+
+The `~w` sigil makes it easy to create a word list -- a list of strings --
+where each word is separated by a space.
+
+```elixir
+> ~w(bulbasaur charmander squirtle)
+["bulbasaur", "charmander", "squirtle"]
+```
+
+By appending an `a` onto that sigil construct, you are instructing Elixir
+that you would instead like a list of atoms.
+
+```elixir
+> ~w(bulbasaur charmander squirtle)a
+[:bulbasaur, :charmander, :squirtle]
+```
+
+[source](http://elixir-lang.org/getting-started/sigils.html#strings)