Fixed bugs in reading hwp format and added test example

HwpFile/test/main.cpp

@@ -0,0 +1,20 @@
+#include "../HWPFile.h"
+#include <iostream>
+
+int main()
+{
+	CHWPFile oFile(L"C:/ONLYOFFICE/Files/hwp/example.hwp");
+
+	if (oFile.Open())
+	{
+		std::cout << "Successful" << std::endl;
+		return 0;
+	}
+	else
+	{
+		std::cout << "Unsuccessful" << std::endl;
+		return -1;
+	}
+
+	oFile.Close();
+}