Create README.md

Github flavored Markdown is also supported syntax highlightling like this:

```haskell
getHomeR :: Handler Html
getHomeR = do
  webSockets chatApp
  defaultLayout $ do
    [whamlet|
    ...
```

Why not use?
https://help.github.com/articles/github-flavored-markdown/#syntax-highlighting
This feature can use like this:

    ```[lang name]
    ```

[lang name]=haskell, syntax highlighting for haskell is enabled.