Added example to README

README.md

@@ -9,7 +9,18 @@ treeify
 Synopsis
 ========
 
- 1. Create your model
+ 1. Create your migration
+
+```
+  create_table :nodes do |t|
+    t.text :name
+    t.integer :parent_id
+    t.references :parent
+  end
+  add_index :nodes, [:parent_id, :id], :unique => true
+```
+
+ 2. Create your model 
 
 ```
 class Node < ActiveRecord::Base
@@ -19,6 +30,22 @@ class Node < ActiveRecord::Base
   validates_uniqueness_of :name
   validates_uniqueness_of :parent_id, :scope=> :id
 end
+```
+
+ 3. Create a tree of stuff
+
+```
+parent = Node.create(name: "parent node")
+
+child = parent.children.create(name: "child 1")
+
+child2 = child.children.create(name: "child 2")
+```
+
+4. Retrieve tree of stuff
+
+```
+parent.descendent_tree
 ```
 
 License