Clear screen on startup

main.c

@@ -118,6 +118,8 @@ efi_main(EFI_HANDLE image_handle, EFI_SYSTEM_TABLE * system_table)
 
     g_system_table = system_table;
 
+    system_table->ConOut->ClearScreen(system_table->ConOut);
+
     write_string(L"My first EFI loader\r\n");
 
     status = system_table->ConIn->Reset(system_table->ConIn, FALSE);