Add README.md, Rules.md, test for project files.

README.md

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+# markdownlint
+
+> A Node.js style checker/lint tool for Markdown files.
+
+## Install
+
+```shell
+npm install markdownlint --save-dev
+```
+
+## Overview
+
+The [Markdown](http://en.wikipedia.org/wiki/Markdown) markup language is
+designed to be easy to read, write, and work with. The language has succeeded,
+but its flexibility is both a benefit and a drawback. Many stylistic decisions
+are left to the author, so formatting can be inconsistent. Some constructs
+don't work well in all parsers and should be avoided.
+
+`markdownlint` is a [static analysis](http://en.wikipedia.org/wiki/Static_program_analysis)
+tool for [Node.js](https://nodejs.org/) and [io.js](https://iojs.org/) with a
+library of rules to enforce standards and correctness for Markdown files. It
+was inspired by - and heavily influenced by - Mark Harrison's [markdownlint
+for Ruby](https://github.com/mivok/markdownlint): the rules, rule
+documentation, and tests for `markdownlint` come directly from that project.
+
+> Aside: If you need a Ruby implementation or CLI, please consider
+> [mdl](https://rubygems.org/gems/mdl). If you work with both platforms, most
+> of what you know can be applied directly.
+
+## Rules
+
+See [Rules.md](doc/Rules.md)
+
+## Usage
+
+...
+
+```js
+...
+```
+
+## Release History
+
+* 0.0.1 - Initial release.