Add Quitting IEx as an elixir til

elixir/quitting-iex.md

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+# Quitting IEx
+
+There are two ways to quit out of an Interactive Elixir shell. The standard
+way is with `Ctrl-c`. This gives you a list of options, one of which is `a`
+for _abort_. This will terminate your IEx session and drop you back on the
+command line where the process started.
+
+Additionally, IEx also understands `Ctrl-\` which is control key that will
+terminate just about any interactive environment. This command will cause
+IEx to immediately exit with no prompt.
+
+Note: IEx does not, however, respond to `Ctrl-d`.
+
+[source](http://blog.plataformatec.com.br/2016/03/how-to-quit-the-elixir-shell-iex/)