Update README.md

Author: DTE-Python

README.md

@@ -10,8 +10,15 @@ A quick program to turn a given image into a hex tileset for GBDK usage.
 Short for "out." The name of the file(s) to output to. You don't need to specify the extention. By default this is "NEW_SET"<br>
 <b>-mF [<i>FILEPATH...]</i></b><br>
 Short for "move folder." You can set the folder of output to <i>FILEPATH</i>. By default this is "/output_default"<br>
+<b>-DG [<i>INT...</i>]</b><br>
+Short for "Dark Grey." Set a custom value for your dark grey colors, between 0 and 255. Defaults to 85. Must be lower than the light grey value.<br>
+<b>-LG [<i>INT...</i>]</b><br>
+Short for "Light Grey." Set a custom value for your light grey colors, between 0 and 255. Defaults to 170. Must be higher than the dark grey value. <br>
 
 <h2>Notes:</h2>
 <b>Unless you specify an output folder you will have to create the "/output_default" folder.</b><br>
 <br>This tool works best with small images, because big ones are impractical for the Gameboy.<br>
 I'm not too savvy with GitHub or really Python in general, but this tool works for me, so I'm happy.
+
+<h3>Planned:</h3>
+I'm hoping to make this tool compatible with GIMP and also with LibreSprite in the future, if I can figure out how to make plugins for either of them.