Readme updated for new external programs

Author: RetiredWizard

README.md

@@ -189,7 +189,19 @@ CircuitPython LCD libraries from https://github.com/dhylands/python_lcd
 **rgbblink.py [pin number]** - program to blink an onboard neopixel or dotstar  
 **rgbrainbow.py [pin number]** - program to color cycle an onboard neopixel or dotstar  
 
-**matrix.py [1|4]** - program to initalize connected HUB75 RGB Matrix Panels as a CircuitPython display. The display object is stored as a PyDOS environment variable (_display). If a 1 in passed as an argument, the matrix is configured as a single 64x32 panel, a 4 configures the matrix as a 2x2 matrix of 64x32 panels.  
+**matrix.py [1|2|4|4w|64x1|64x2|64x4|64x4w]** - program to initalize connected HUB75 RGB Matrix Panels as a CircuitPython display. The display object is stored as a PyDOS environment variable (_display).  
+  
+Parameters:  
+1 - single 64x32 panel  
+2 - 2x1 matrix of 64x32 panels  
+4 - 2x2 matrix of 64x32 panels   
+4w - 4x1 matrix of 64x32 panels
+64x1 - singel 64x64 panel
+64x2 - 2x1 matrix of 64x64 panels
+64x4 - 2x2 matrix of 64x64 panels
+64x4w - 4x1 matrix of 64x64 panels
+
+**Playimage.py [filename]** - program to display .bmp, .jpg, .gif or .png image files. If the program is loaded from PyDOS it attempts to determine the appropriate display configuration from the PyDOS environment, otherwise several display options are supported and selected depending on the existence of BOARD.Display or locally installed display libraries.
 
 **reboot.py** - performs a soft reboot (Micropython requires a Ctrl-D to complete)