README.md in grape-dsl-1.1.4 vs README.md in grape-dsl-1.2.0

@@ -2,9 +2,58 @@
 ============
 
 DSL for Grape module that let you use some basic function much easier
 if you use redmine wiki you can even create doc into it
 
+### Use case
+
+you can mount Grape::API-s all child class with
+```ruby
+    class MainApi < Grape::API
+        mount_subclasses
+    end
+```
+
+you can mount only a single singleton method from a class like this
+ps.: you can even set arguments to be json or yaml so it will be parsed before passing to method
+```ruby
+
+    class TestClass
+
+        def self.test_method hello
+
+        end
+
+        def self.complex_method
+        def self.complex_method hello, world="default", opts={},*args
+
+              puts "hello: #{hello}"
+              puts "world: #{world}"
+              puts "opts:  #{opts.inspect}"
+              puts "args:  #{args.inspect}"
+              puts "---"
+
+        end
+
+    end
+
+    class Api < Grape::API
+
+        mount_method TestClass, :test_method
+        mount_method Test,:test, "hello_world",[:opts,:json],[:args,:json]
+
+    end
+
+```
+
+or if you are big fan of the CURS , then you can use this two method:
+response_headers_to_new_calls
+response_headers_to_routes_options_request
+
+there is description in he headers file.
+
+so stuffs like this can be found in this project
+
 
 ## LICENSE
 
 (The MIT License)