Add packages.json to make this a npm module

- Used 'querystring-yui' as package name because querystring is already
  taken and package names shouldn't contain 'node' or 'js'.
- Update readme.

README.md

@@ -15,7 +15,7 @@ and __querystring-stringify__ sub-modules, repsectively.
 ### parse example
 
     var sys = require("util");
-    var qs = require("./querystring");
+    var qs = require("querystring-yui");
 
     var str = qs.parse("foo=bar&baz=qux");
     sys.puts(JSON.stringify(str)); // => {"foo":"bar","baz":"qux"}
@@ -28,7 +28,7 @@ and __querystring-stringify__ sub-modules, repsectively.
 ### stringify example
 
     var sys = require("util");
-    var qs = require("./querystring");
+    var qs = require("querystring-yui");
 
     var obj = {"foo":"bar","baz":"qux"};
     sys.puts(qs.stringify(obj)); // => foo=bar&baz=qux

package.json

@@ -0,0 +1,11 @@
+{
+  "name": "querystring-yui",
+  "description": "A robust querystring parsing module for node.js, based on the YUI QueryString module.",
+  "version": "0.0.1",
+  "main": "querystring.js",
+  "license": "BSD",
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/MitchellMcKenna/querystring-yui"
+  }
+}