Add Word Lists For Atoms as an elixir til

elixir/word-lists-for-atoms.md

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+# Word Lists For Atoms
+
+The `~w` sigil works similarly to Ruby's `%w` (word array notation). It
+allows you to create a list of words (namely, strings).
+
+```elixir
+~w(one two three)
+["one", "two", "three"]
+```
+
+It sets itself apart though with some modifiers. The default behavior
+matches the `s` modifier (for strings).
+
+```elixir
+> ~w(one two three)s
+["one", "two", "three"]
+```
+
+Where it gets more interesting is with the `a` modifier allowing you to
+create a list of atoms.
+
+```elixir
+> ~w(one two three)a
+[:one, :two, :three]
+```
+
+Note: there is a third modifier, `c`, for char lists.
+
+```elixir
+> ~w(one two three)c
+['one', 'two', 'three']
+```
+
+[source](http://elixir-lang.org/getting-started/sigils.html)