doc: Separate pages into sub directories.

docs/development/coding-style.md

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+# Coding style
+
+## C++ and Python
+
+For C++ and Python, we just follow Chromium's [Coding
+Style](http://www.chromium.org/developers/coding-style), there is also a
+script `script/cpplint.py` to check whether all files confirm.
+
+The python's version we are using now is Python 2.7.
+
+## CoffeeScript
+
+For CoffeeScript, we follow GitHub's [Style
+Guide](https://github.com/styleguide/javascript), and also following rules:
+
+* Files should **NOT** end with new line, because we want to match Google's
+  styles.
+* File names should be concatenated with `-` instead of `_`, e.g.
+  `file-name.coffee` rather than `file_name.coffee`, because in
+  [github/atom](https://github.com/github/atom) module names are usually in
+  the `module-name` form, this rule only apply to `.coffee` files.
+
+## API Names
+
+When creating a new API, we should prefer getters and setters instead of
+jQuery's one-function style, for example, `.getText()` and `.setText(text)`
+are preferred to `.text([text])`. There is a
+[discussion](https://github.com/atom/atom-shell/issues/46) of this.