started with xls import

src/core/excelreader.cpp

@@ -0,0 +1,18 @@
+#include "excelreader.h"
+
+#include <xlnt/xlnt.hpp>
+
+void ExcelReader::readSellersFromFile(const std::string& filename, Marketplace* market)
+{
+    xlnt::workbook wb;
+    wb.load(filename);
+    auto ws = wb.sheet_by_index(0);
+
+    const int START_ROW = 6;
+    const int END_ROW = 349;
+
+    for (const auto& row : ws.rows(false)) {
+        //auto test = row[0].value<int>();
+        //std::cout << test << "\n";
+    }
+}