basic Install & Usage sections added.

README.md

@@ -4,3 +4,39 @@ ArrayDB
 [![Build Status](https://travis-ci.org/bfontaine/ArrayDB.png)](https://travis-ci.org/bfontaine/ArrayDB)
 
 Use your arrays as DB tables, and make queries on them.
+
+Install
+-------
+
+```
+[sudo] npm install [-g] arraydb
+```
+
+Usage
+-----
+
+ArrayDB objects expose one method, `.query`, which use pattern-matching:
+
+```js
+var ArrayDB = require( 'arraydb' ).ArrayDB;
+
+var a = new ArrayDB([
+
+    { name: "Foo", age: 42 },
+    { name: "Bar", age: 24 },
+    { name: "Moo", age: 42 }
+
+]);
+
+a.query({ age: 42 }); // [ { name:"Foo", age:42 }, { name:"Moo",age:42} ]
+```
+
+You can also monkey-patch `Array` objects:
+
+```js
+var ArrayDB = require( 'arraydb' ).ArrayDB;
+
+ArrayDB.monkeyPatch();
+
+typeof [].query === 'function'; // true
+```