adding README

README.md

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+# node-readability
+[Readability.js by Arc90](http://lab.arc90.com/experiments/readability/) ported to node.js.
+
+Blog post: [Server side readability with node.js](http://arrix.blogspot.com/2010/11/server-side-readability-with-nodejs.html)
+## Requirements
+* [node.js](http://nodejs.org/)
+* [jsdom](https://github.com/tmpvar/jsdom)
+* [htmlparser](https://github.com/tautologistics/node-htmlparser)
+
+## Live demo
+I'm working on it...
+## Example
+
+    var readability = require('readability');
+    //...
+    // This is an very early example. The API is subject to change.
+    readability.parse(html, url, function(result) {
+        console.log(result.title, result.content);
+    });
+
+## Performance
+In my testing of 70 pages with an average size of **58KB** collected from [digg](http://digg.com/news.rss), [delicious](http://feeds.delicious.com/v2/rss/?count=50) and [hacker news](http://news.ycombinator.com/rss), the average time taken for each page is about **1.3 seconds** on a Mac Mini (2.4G Intel Core 2 Duo).
+## Limitation
+* no fetching next pages
+* no support for frames
+
+## Plan
+* Performance optimization
+* Better API, more options
+* Support more readability features