add cpp and header separation sample

.gitignore

@@ -7,5 +7,8 @@
 # Include all cpp file under all folder
 !**/*.cpp
 
+# Include all h file under all folder
+!**/*.h
+
 # Include .gitignore itself
-!.gitignore
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+!.gitignore

04.HandsOn/common/Setup.cpp

+#include <iostream>
+#include "Setup.h"
+
+using namespace std;
+
+// 设定分辨率
+void Setup::setResolution() {
+
+    this->resolution_width = 1920;  // 从设定处取得
+    this->resolution_height = 1080; // 从设定处取得
+
+};
+
+// 取得分辨率
+int Setup::getResolution() {
+
+    // 水平分辨率 X 垂直分辨率
+    return this->resolution_width * this->resolution_height;
+
+};
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04.HandsOn/common/Setup.h

+#pragma once // 防止头文件被重复包含
+
+#include <iostream>
+
+using namespace std;
+
+// 用于存放各类设置
+class Setup {
+
+    private:
+
+        // 水平分辨率
+        int resolution_width;
+        // 垂直分辨率
+        int resolution_height;
+    
+    public:
+
+        // 设定分辨率
+        void setResolution();
+
+        // 取得分辨率
+        int getResolution();
+
+};
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04.HandsOn/main.cpp

+#include <iostream>
+#include "common/Setup.h"
+
+int main() {
+
+    Setup s;
+    s.setResolution();
+    cout << "Resolution: "<< s.getResolution() << endl;
+
+}
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