Add tentative readme

Author: HashNuke

README.md

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+## Heroku Elixir Buildpack
+
+[ This readme is also a TODO. More docs coming. After I get some sleep. ]
+
+Has support for using prebuilt Elixir binaries. Borrows heavily from Gosha Arinich's [work](https://github.com/goshakkk/heroku-buildpack-elixir).
+
+
+#### To create a Heroku app with this buildpack
+
+    heroku create --buildpack "https://github.com/HashNuke/heroku-elixir-buildpack.git"
+
+
+#### To set the buildpack of an existing Heroku app
+
+    heroku config:add BUILDPACK_URL="https://github.com/HashNuke/heroku-elixir-buildpack.git" -a APP_NAME
+
+
+#### To set your Elixir and Erlang versions
+
+* Create a `.language_versions` file in your app's root dir.
+
+* Refer to the default `[.language_versions](https://github.com/HashNuke/heroku-elixir-buildpack/blob/master/.language_versions)` that comes with this repository for syntax. It is just a bash file.
+
+
+#### Procfile
+
+You can add your own Procfile. If you don't add one, the default profile will run `mix server -p $PORT`.