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/AbstractFactoryPattern/concrete_product.h

@@ -0,0 +1,72 @@
+//
+// Created by xiemenghui on 2018/7/20.
+//
+
+#ifndef DESIGNPATTERN_CONCRETE_PRODUCT_H
+#define DESIGNPATTERN_CONCRETE_PRODUCT_H
+
+#include "product.h"
+
+/********** 汽车 **********/
+// 奔驰
+class BenzCar : public ICar
+{
+public:
+    string Name()
+    {
+        return "Benz Car";
+    }
+};
+
+// 宝马
+class BmwCar : public ICar
+{
+public:
+    string Name()
+    {
+        return "Bmw Car";
+    }
+};
+
+// 奥迪
+class AudiCar : public ICar
+{
+public:
+    string Name()
+    {
+        return "Audi Car";
+    }
+};
+
+/********** 自行车 **********/
+// 奔驰
+class BenzBike : public IBike
+{
+public:
+    string Name()
+    {
+        return "Benz Bike";
+    }
+};
+
+// 宝马
+class BmwBike : public IBike
+{
+public:
+    string Name()
+    {
+        return "Bmw Bike";
+    }
+};
+
+// 奥迪
+class AudiBike : public IBike
+{
+public:
+    string Name()
+    {
+        return "Audi Bike";
+    }
+};
+
+#endif //DESIGNPATTERN_CONCRETE_PRODUCT_H