Rests model was added

models/restsmodel.h

@@ -0,0 +1,23 @@
+#ifndef RESTSMODEL_H
+#define RESTSMODEL_H
+
+#include "models/basemodel.h"
+
+class RestsModel : public BaseModel
+{
+public:
+    explicit RestsModel(QObject *parent = nullptr);
+
+    float productRest(const QString &storeId, const QString &productId);
+    void submitRest(const QString &storeId, const QString &productId, float rest);
+
+private:
+    QVariantMap findRest(const QString &storeId, const QString &productId);
+    void loadCache();
+    void clearCache();
+
+    using Key = QPair<QString, QString>;
+    QMap<Key, QVariantMap> m_rests;
+};
+
+#endif // RESTSMODEL_H