New classes added

src/core/article.h

@@ -0,0 +1,27 @@
+#ifndef ARTICLE_H
+#define ARTICLE_H
+
+#include "entity.h"
+#include "seller.h"
+
+#include <string>
+#include <memory>
+
+class Seller;
+
+class Article : public Entity
+{
+public:
+    Article();
+    Article(std::shared_ptr<Seller> sellerPtr);
+    void setArticleNo(int articleNo);
+    void setPrice(int price);
+    void setDescription(const std::string& description);
+private:
+    std::shared_ptr<Seller> sellerPtr{};
+    int articleNo{};
+    int price{};
+    std::string description{};
+};
+
+#endif