Update NFC Payload Layout

NFC-Payload-Layout.md

@@ -33,4 +33,15 @@ flowchart LR
 | Card | Event bytes | Palette byte | UUID suffix | Quote text |
 | --- | --- | --- | --- | --- |
 | Blue Portal | `E9 24` | `01` | `47 F2` | `Speedy thing goes in` |
-| GLaDOS | `E9 24` | `03` | `DA 45` | `The cake is a lie` |
+| GLaDOS | `E9 24` | `03` | `DA 45` | `The cake is a lie` |
+
+
+## Details on image data
+
+- 38x38px
+- 8 color palettes x 16 colors
+- Pixel encoding?
+
+## "Official" documentation
+
+![](https://git.rhetenor.de/rhetenor/creaturedex/raw/commit/af2d1712ae664d5bcc2bb370e2e727e6f501e852/docs/img/nfc-data-layout.png)