updated readme

app/models/ability.rb

@@ -0,0 +1,20 @@
+class Ability
+  include CanCan::Ability
+
+  def initialize(user)
+    user ||= User.new
+    
+    can :manage, :all if user.admin?
+    
+    can :read, Category, :state => true
+    can :read, Forum, :state => true, :category => { :state => true }
+    can :read, Topic, :forum => { :state => true, :category => { :state => true } }
+    can :read, Post, :topic => { :forum => { :state => true, :category => { :state => true } } }
+    
+    can :update, Post, :user_id => user.id
+    can :destroy, [Topic,Post], :user_id => user.id
+    
+    can :create, Post unless user.new_record?
+    can :create, Topic unless user.new_record?
+  end
+end