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Updated ice40hx8k readme to include acsii art cable diagrams

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boards/ice40hx8k/README.md
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@ -2,7 +2,7 @@
Maintainer: Alan Garfield https://github.com/alangarf
![Terasic DE0 board photo](images/terasic_DE0.jpg)
![iCE40HX8K board photo](https://github.com/alangarf/apple-one/raw/master/media/iCE40HX8K-breakout.png)
### Build environment
The project was started with IceCube2, and the project files are in the subdirectory 'icecube2'. These haven't been updated in a while, but should prove a worthy starting point. I'll endeavour to keep them updated when I can.
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* UART support using the second serial channel on the breakout board. (CTS support OS willing).
* VGA support (will require a cable to be made).
* PS/2 support (will require a cable to be made).
* LED support using onboard LEDs on breakout, additional LEDs added to mine via a [https://www.ebay.com.au/itm/4-4-Matrix-Array-Keyboard-16-Key-Switch-Keypad-8-LED-4-Button-Professional-Blue/183044563197](YL-4 board from ebay).
* LED support using onboard LEDs on breakout, additional LEDs added to mine via a [YL-4 board from ebay](https://www.ebay.com.au/itm/4-4-Matrix-Array-Keyboard-16-Key-Switch-Keypad-8-LED-4-Button-Professional-Blue/183044563197).
### VGA Cable
```
270 ohm
vga_red pin - B1 -----/\/\/\----- VGA PIN 1
vga_grn pin - B2 -----/\/\/\----- VGA PIN 2
vga_blu pin - C1 -----/\/\/\----- VGA PIN 3
vga_h_sync - C2 ---------------- VGA PIN 13
vga_v_sync - D1 ---------------- VGA PIN 14
GND -------o-------- VGA PIN 5
|-------- VGA PIN 6
|-------- VGA PIN 7
|-------- VGA PIN 8
\-------- VGA PIN 10
```
### PS/2 Cable
```
ps2_clk - N3 -----/\/\/\----- PS/2 PIN 5
ps2_din - N2 -----/\/\/\----- PS/2 PIN 1
GND ------o--------- PS/2 PIN 3
|
|
ext. psu GND ------/
ext. psu 5V ---------------- PS/2 PIN 4