Change index.rst to README.rst

remove all pattern's README.md

Behavioral/NullObject/README.md

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-# Null Object
-
-## Purpose
-
-NullObject is not a GoF design pattern but a schema which appears frequently enough to be considered a pattern. It has the following benefits:
-
-* Client code is simplified
-* Reduces the chance of null pointer exceptions
-* Fewer conditionals require less test cases
-
-Methods that return an object or null should instead return an object or `NullObject`. `NullObject`s simplify boilerplate code such as `if (!is_null($obj)) { $obj->callSomething(); }` to just `$obj->callSomething();` by eliminating the conditional check in client code.
-
-## Examples
-
-* Symfony2: null logger of profiler
-* Symfony2: null output in Symfony/Console
-* null handler in a Chain of Responsibilities pattern
-* null command in a Command pattern
-
-## UML Diagram
-
-![Alt NullObject UML Diagram](uml/uml.png)