added extra info on default settings

Author: pkscout

README.md

@@ -40,7 +40,13 @@ You should install this card using [HACS](https://hacs.xyz).
 | infospacing | integer | 0 | change space between info rows (in px)
 | infoedge | integer | 0 | change space between edge of display and edge of info slots (in px)
 
-The defaults are set for a RaspberryPi 7" touch display.  If you change the display width and height, you'll want to adjust the font sizes to fit.  The card will do some amount of automatic respacing based on font size, but you can also manually fine tune it as needed with the other options.
+The defaults are set for a RaspberryPi 7" touch display.  The default colors assume the following:
+- outdoor information in the left column
+- forecast high in the middle upper slot
+- forecast low in the middle lower slot
+- indoor information in the right column
+
+If you change the display width and height, you'll want to adjust the font sizes to fit.  The card will do some amount of automatic respacing based on font size, but you can also manually fine tune it as needed with the other options.
 
 **Example**