Update README.md

add small example of what can be done.

README.md

@@ -1,6 +1,25 @@
 PyJNIus
 =======
 
+description
+-----------
+
 Python module to access Java class as Python class, using JNI.
 
 (Work in progress.)
+
+quick overview
+--------------
+
+>>> from jnius.reflect import autoclass
+>>> autoclass('java.lang.System').out.println('Hello world')
+Hello world
+
+>>>Stack = autoclass('java.util.Stack')
+>>>stack = Stack()
+>>>stack.push('hello')
+>>>stack.push('world')
+>>>print stack.pop()
+world
+>>>print stack.pop()
+hello