add adapter to readme

Author: welmends

README.md

@@ -12,3 +12,4 @@
 |[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)|
 |[Private Class Data](https://github.com/welmends/DesignPatternPy/blob/master/PrivateClassData)|[Code](https://github.com/welmends/DesignPatternPy/blob/master/PrivateClassData/PrivateClassData.ipynb)|
+|[Adapter](https://github.com/welmends/DesignPatternPy/blob/master/Adapter)|[Code](https://github.com/welmends/DesignPatternPy/blob/master/Adapter/Adapter.ipynb)|