Add readme

README.md

@@ -1,19 +1,24 @@
 # Elixir Koans
 
-**TODO: Add description**
+Elixir koans is a fun, easy way to get started with the elixir programming language. It is a tour
+of the most important features and idiomatic usage of the language.
 
-## Installation
+### Prerequisites
 
-If [available in Hex](https://hex.pm/docs/publish), the package can be installed as:
+The only dependency needed to run these koans is the Elixir language. Please refer to the
+[official guide](http://elixir-lang.org/install.html) for instructions.
 
-  1. Add elixir_koans to your list of dependencies in `mix.exs`:
+### Running
 
-        def deps do
+With Elixir installed, just navigate to the root directory of this project and run:
-          [{:elixir_koans, "~> 0.0.1"}]
+```sh
-        end
+$ mix meditate
+```
+to get going. You should see the first failure with a blank line in it. The goal is
+to fill in the blanks and make all the koans pass by doing so.
 
-  2. Ensure elixir_koans is started before your application:
+### Contributing
 
-        def application do
+We welcome contributions! If something does not make sense along the way or you feel
-          [applications: [:elixir_koans]]
+like an important lesson is missing from the koans, feel free to fork the project
-        end
+and open a pull request.