Kh documentation

@boonrs integrated the documentation using markdown. Things I'm holding off on ...

- linking to 311 data in the research and references section (want to find a way to present this data)
- screenshots of the app (waiting for the geocoding stuff to get sorted out)

Also, feel free to add a better description of the API and what it does. I just through some rough text in there. 



The link should be qualified by `http://`.
When it comes to links, I'm a fan of breaking them out of the text and grouping them at the bottom of a section. For example:
```
### Libraries
* [Nancy][nancy] is the web framework for the API.
* [Dapper][dapper] is a mini-object operational mapper for the API.
* [Simpler][simpler] is a command pattern library for the API.

[nancy]: http://nancyfx.org
[dapper]: https://github.com/StackExchange/dapper-dot-net
[simpler]: https://github.com/gregoryjscott/Simpler
```
I think this adds to the readability and maintainability of the page when editing.