Update README.txt

README.txt

@@ -21,8 +21,16 @@ This is a project that is part of the MLOD UV.
             
               *  https://web.archive.org/web/20130212063528/http://www.cis.uab.edu/hyatt/boardrep.html
               *  https://en.wikipedia.org/wiki/0x88
+              *  https://decimal.info/hex-to-decimal/8/how-to-convert-0X88-to-decimal.html
 
 
++- ASCII art :
+    *   https://www.asciiart.eu/sports-and-outdoors/chess
+
+
++- Chess symbols in Unicode : 
+   *    https://en.wikipedia.org/wiki/Chess_symbols_in_Unicode
+
 +- Chess board notation : 
 
           =>  Algebraic notation .