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Show 13x13 sparse scanning matrix in README

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keyboards/tutte_coxeter_36k/readme.md
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@ -8,7 +8,28 @@ This is firmware for a Raspberry Pi Pico PR2040 controller monoblock 36 key desi
[Tutte-Coxeter](https://en.wikipedia.org/wiki/Tutte%E2%80%93Coxeter_graph) graph [Tutte-Coxeter](https://en.wikipedia.org/wiki/Tutte%E2%80%93Coxeter_graph) graph
(using only 26 vertices or GPIO pins, with 36 edges or keys - see this (using only 26 vertices or GPIO pins, with 36 edges or keys - see this
[blog post](https://astrobeano.blogspot.com/2025/05/ergo-mech-keyboard-wiring-using-tutte-coxeter-graph.html) [blog post](https://astrobeano.blogspot.com/2025/05/ergo-mech-keyboard-wiring-using-tutte-coxeter-graph.html)
for background, although the final pin selection and trace routing changed). for background, although the final pin selection and trace routing changed):
| | GP11 | GP10 | GP3 | GP4 | GP7 | GP26 | GP27 | GP28 | GP15 | GP21 | GP19 | GP20 | GP16 |
|------|------|------|-----|-----|-----|------|------|------|------|------|------|------|------|
| GP12 | Z | | | | | | J | | | | | | |
| GP8 | Q | S | | | | | | | | | | ; | |
| GP9 | | X | C | | | | | | | | | | |
| GP1 | | | D | R | | | | | | O | | | |
| GP6 | | | | V | G | | | | | | | | |
| GP2 | | W | | | T | Y | | | | | | | |
| GP22 | | | | | | H | M | | | | | | R3 |
| GP0 | | | E | | | | U | I | | | | | |
| GP13 | | | | | B | | | K | L2 | | | | |
| GP14 | A | | | | | | | | L1 | L | | | |
| GP18 | | | | | | N | | | | . | R2 | | |
| GP17 | | | | | | | | , | | | R1 | / | |
| GP5 | | | | F | | | | | | | | P | L3 |
The keys here are labeled as per Qwerty, with L1, L2, L3, R3, R2, and R1 for the thumbs.
The firmware follows the `LAYOUT_split_3x5_3` QMK community layout convention, making it much
easier to use with an existing layout like Miryoku.
The first physical PCB for this was designed using the [Gamma Omega The first physical PCB for this was designed using the [Gamma Omega
keyboard](https://github.com/unspecworks/gamma-omega) footprint from Ergogen. keyboard](https://github.com/unspecworks/gamma-omega) footprint from Ergogen.