Add installation and configuration instructions to project README.

README.md

@@ -1,6 +1,49 @@
-TreeModel
-=========
+# TreeModel
 
 Manipulate and traverse tree-like structures in javascript.
 
-http://jnuno.com/tree-model-js
+For download, API and demos, please [visit tree-model-js website](http://jnuno.com/tree-model-js).
+
+## Instalation
+
+### Node
+TreeModel is available as a npm module so you can install it with `npm install tree-model` and use it in your script:
+
+```
+var TreeModel = require('tree-model'),
+    tree = new TreeModel(),
+    root = tree.parse({name: 'a', children: [{name: 'b'}]});
+```
+
+### Browser
+#### Using [requirejs](http://requirejs.org/)
+```
+<script src="path/to/require.js"></script>
+<script>
+    require(["path/to/TreeModel"], function(TreeModel) {
+        var tree = new TreeModel(),
+            root = tree.parse({name: 'a', children: [{name: 'b'}]});
+    });
+</script>
+```
+#### As a global variable
+```
+<script src="path/to/TreeModel.js"></script>
+<script>
+    var tree = new TreeModel(),
+        root = tree.parse({name: 'a', children: [{name: 'b'}]});
+</script>
+```
+
+## Configuration
+You can pass the property name of the children array and a comparator function to be used by `parse` and by `addChild`:
+```
+var tree = new TreeModel({
+    // Default is 'children'
+    childrenPropertyName: 'dependencies',
+    modelComparatorFn: function (a, b) {
+        // Reverse order by name
+        return a.name < b.name;
+    }
+});
+```