add render

README.md

@@ -3,6 +3,9 @@
 Sample gamma rays with low cost device to capture entropy to be fed
 back to the computer via USB.
 
+![gammaray2usb render](pics/gammaray2usb.png)
+
+
 # Disclaimer
 This is a development/learning project, not done by EEs like other
 projects here!