updated readme

app/models/category.rb

@@ -0,0 +1,14 @@
+class Category < ActiveRecord::Base
+  
+  # Associations
+  has_many :forums, :dependent => :destroy
+  
+  # Accessors
+  attr_accessible :title, :state, :position, :category_id
+  
+  # Scopes
+  default_scope :order => 'position ASC'
+  
+  # Validations
+  validates :title,       :presence => true
+end