+ update read.me file

 + fdd1.img file example

Author: DnCraptor

README.md

@@ -5,3 +5,5 @@ To use HDD: save hdd.img (from hdd.img.zip) to <SD-card-drive>:\XT\hdd.img
 To switch to USB-drives mode press: Enter + Backspace
 
 To change overcloking: Left Ctrl + Tab + Numpad "+" or Numpad "-"
+
+To use own FDD imgage, that will be shown as drive "B:", put fdd0.img file into <SD-card>:\XT\fdd01.img