add business delegate pattern on readme

Author: welmends

README.md

@@ -7,7 +7,7 @@
 | Repository Folder | .ipynb File | | Repository Folder | .ipynb File |
 |:------------- |:-------------|:-------------|:------------- |:-------------|
 |[Abstract Factory](https://github.com/welmends/DesignPatternPy/tree/master/AbstractFactory)|[Code](https://github.com/welmends/DesignPatternPy/blob/master/AbstractFactory/AbstractFactory.ipynb)| |[Facade](https://github.com/welmends/DesignPatternPy/blob/master/Facade)|[Code](https://github.com/welmends/DesignPatternPy/blob/master/Facade/Facade.ipynb)|
-|[Singleton](https://github.com/welmends/DesignPatternPy/tree/master/Singleton)|[Code](https://github.com/welmends/DesignPatternPy/blob/master/Singleton/Singleton.ipynb)|
+|[Singleton](https://github.com/welmends/DesignPatternPy/tree/master/Singleton)|[Code](https://github.com/welmends/DesignPatternPy/blob/master/Singleton/Singleton.ipynb)| |[Business Delegate](https://github.com/welmends/DesignPatternPy/blob/master/BusinessDelegate)|[Code](https://github.com/welmends/DesignPatternPy/blob/master/BusinessDelegate/BusinessDelegate.ipynb)|
 |[Prototype](https://github.com/welmends/DesignPatternPy/blob/master/Prototype)|[Code](https://github.com/welmends/DesignPatternPy/blob/master/Prototype/Prototype.ipynb)|
 |[Builder](https://github.com/welmends/DesignPatternPy/blob/master/Builder)|[Code](https://github.com/welmends/DesignPatternPy/blob/master/Builder/Builder.ipynb)|
 |[Object Pool](https://github.com/welmends/DesignPatternPy/blob/master/ObjectPool)|[Code](https://github.com/welmends/DesignPatternPy/blob/master/ObjectPool/ObjectPool.ipynb)|