Elixir hello world example

examples/elixir_hello_world/README.md

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+Elixir Hello World
+==================
+
+This is an example of running Cowboy with [Elixir](http://elixir-lang.org).
+
+You need Elixir installed
+([instructions here](http://elixir-lang.org/getting_started/1.html))
+to run this example. After installing Elixir, you should have both
+`elixir` and `mix` executables available.
+
+You also need [rebar](https://github.com/rebar/rebar) in your PATH
+to compile dependencies.
+
+Then type the following command:
+
+```
+mix deps.get
+```
+
+The command above will fetch all dependencies and compile them.
+
+You can then start the Erlang node with the following command:
+
+```
+mix run --no-halt
+```
+
+Then point your browser to localhost:8080.
+
+Example
+-------
+
+``` bash
+$ curl -i http://localhost:8080
+HTTP/1.1 200 OK
+connection: keep-alive
+server: Cowboy
+date: Fri, 28 Sep 2012 04:10:25 GMT
+content-length: 12
+
+Hello world!
+```