started with xls import

src/core/excelreader.h

@@ -0,0 +1,18 @@
+#ifndef EXCEL_READER_H
+#define EXCEL_READER_H
+
+#include "seller.h"
+#include "marketplace.h"
+
+#include <memory>
+#include <string>
+#include <vector>
+
+class ExcelReader
+{
+  public:
+    static void readSellersFromFile(const std::string& filename,
+                                    Marketplace* market);
+};
+
+#endif