added cookie examples to README

README.rdoc

@@ -105,6 +105,22 @@ use whatever proxy the system is configured to use:
 
   RestClient.proxy = ENV['http_proxy']
 
+== Cookies
+
+Request and Response objects know about HTTP cookies, and will automatically
+extract and set headers for them as needed:
+
+  response = RestClient.get 'http://example.com/action_which_sets_session_id'
+  response.cookies
+  # => {"_applicatioN_session_id" => "1234"}
+
+  response2 = RestClient.post(
+    'http://localhost:3000/',
+    {:param1 => "foo"},
+    {:cookies => {:session_id => "1234"}}
+  )
+  # ...response body
+
 == Meta
 
 Written by Adam Wiggins (adam at heroku dot com)