x230: add ch341a documentation and photo

x230/README.md

@@ -150,14 +150,17 @@ is used by some cheap memory programmers.
 The one we describe can be bought at
 [aliexpress](http://www.aliexpress.com/item/Free-Shipping-CH341A-24-25-Series-EEPROM-Flash-BIOS-DVD-USB-Programmer-DVD-programmer-router-Nine/32583059603.html),
 but it's available [elsewhere](https://geizhals.eu/?fs=ch341a) too.
+Also, we don't use the included 3,3V power output (provides too little power),
+but a seperate power supply. If you don't have any, consider getting a AMS1117
+based supply for a second USB port (like [this](https://de.aliexpress.com/item/1PCS-AMS1117-3-3V-Mini-USB-5V-3-3V-DC-Perfect-Power-Supply-Module/32785334595.html) or [this](https://geizhals.eu/1415110251)).
 
 * Leave the P/S Jumper connected (programmer mode, 1a86:5512 USB device)
-* Connect the programmer to your PC's USB port
-* Connect your clip or hooks to the programmer's SPI pins
-
-
-	TODO description and foto
+* Connect 3,3V from your external supply to the Pomona clip's (or hook) VCC
+* Connect GND from your external supply to GND on your CH341A programmer
+* Connect your clip or hooks to the rest of the programmer's SPI pins
+* Connect the programmer (and power supply, if USB) to your PC's USB port
 
+![ch341a programmer with extra USB power supply](ch341a.jpg)
 
 #### unpack the Skulls release archive