Add String Interpolation With Just About Anything as an elixir til

elixir/string-interpolation-with-just-about-anything.md

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+# String Interpolation With Just About Anything
+
+Coming to Elixir from Ruby, I am used to being able to interpolate literally
+_anything_ into a string. In Elixir, this is not the case.
+
+> By default, it handles strings, atoms (including nil, true, false and
+> module name aliases like String – which are all just atoms behind the
+> scenes), integers, floats, and some lists. That's it.
+
+There are two approaches you can take to interpolate everything else into a
+string. The easier approach is to use
+[`Kernel.inspect/2`](http://elixir-lang.org/docs/stable/elixir/Kernel.html#inspect/2).
+
+```elixir
+> IO.puts "A map #{inspect %{a: 1, b: 2}}"
+A map %{a: 1, b: 2}
+```
+
+The other approach is to implement the `String.Chars` protocol for the thing
+that you are trying to print. You can read more about that in [_Elixir
+String Interpolation for
+Rubyists_](http://thepugautomatic.com/2016/01/elixir-string-interpolation-for-the-rubyist/).