添加设计模式及例子，包括：单例、抽象工厂、适配器、桥接、观察者模式

DesignPattern/BridgePattern/implementor.h

@@ -0,0 +1,17 @@
+//
+// Created by xiemenghui on 2018/7/21.
+//
+
+#ifndef DESIGNPATTERN_IMPLEMENTOR_H
+#define DESIGNPATTERN_IMPLEMENTOR_H
+
+// 电器
+class IElectricalEquipment
+{
+public:
+    virtual ~IElectricalEquipment(){}
+    virtual void PowerOn() = 0;     // 打开
+    virtual void PowerOff() = 0;    // 关闭
+};
+
+#endif //DESIGNPATTERN_IMPLEMENTOR_H