better documentation on how to use configure

README.rdoc

@@ -922,7 +922,20 @@ The <tt>request.body</tt> is an IO or StringIO object:
 Run once, at startup, in any environment:
 
   configure do
-    ...
+    # setting one option
+    set :option, 'value'
+    
+    # setting multiple options
+    set :a => 1, :b => 2
+    
+    # same as `set :option, true`
+    enable :option
+    
+    # same as `set :option, false`
+    disable :option
+    
+    # you can also have dynamic settings with blocks
+    set(:css_dir) { File.join(views, 'css') }
   end
 
 Run only when the environment (RACK_ENV environment variable) is set to
@@ -939,6 +952,18 @@ Run when the environment is set to either <tt>:production</tt> or
     ...
   end
 
+You can access those options via <tt>settings</tt>:
+
+  configure do
+    set :foo, 'bar'
+  end
+
+  get '/' do
+    settings.foo? # => true
+    settings.foo  # => 'bar'
+    ...
+  end
+
 == Error Handling
 
 Error handlers run within the same context as routes and before filters, which