updated readme

app/models/forum.rb

@@ -0,0 +1,19 @@
+class Forum < ActiveRecord::Base
+  
+  # Associations
+  has_many :topics, :dependent => :destroy
+  has_many :posts, :through => :topics
+  
+  belongs_to :category
+  
+  # Accessors
+  attr_accessible :title, :description, :state, :position, :category_id
+  
+  # Scopes
+  default_scope :order => 'position ASC'
+  
+  # Validations
+  validates :title,       :presence => true
+  validates :description, :presence => true
+  validates :category_id, :presence => true
+end