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/concrete_implementor.h

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+//
+// Created by xiemenghui on 2018/7/21.
+//
+
+#ifndef DESIGNPATTERN_CONCRETE_IMPLEMENTOR_H
+#define DESIGNPATTERN_CONCRETE_IMPLEMENTOR_H
+
+#include "implementor.h"
+#include <iostream>
+
+// 电灯
+class Light : public IElectricalEquipment
+{
+public:
+    // 开灯
+    virtual void PowerOn() override
+    {
+        std::cout << "Light is on." << std::endl;
+    }
+    // 关灯
+    virtual  void PowerOff() override
+    {
+        std::cout << "Light is off." << std::endl;
+    }
+};
+
+// 风扇
+class Fan : public IElectricalEquipment
+{
+public:
+    // 打开风扇
+    virtual void PowerOn() override
+    {
+        std::cout << "Fan is on." << std::endl;
+    }
+    //关闭风扇
+    virtual  void PowerOff() override
+    {
+        std::cout << "Fan is off." << std::endl;
+    }
+};
+
+
+#endif //DESIGNPATTERN_CONCRETE_IMPLEMENTOR_H