Ender 3 - Add BTT SKR mini E3 v2 pinout

creality-ender3/README.md

@@ -239,3 +239,7 @@ After firware update, proceed with the different calibrations in the above order
 | PSU exhaust fan silencer | [Printable](https://www.printables.com/model/84197-60mm-exhaust-fan-silencer-flowmaster-psu-ender3nep/comments#preview.file.GpvjC) | ![show off](images/mods/psu-exhaust-fan-silencer.jpg) |
 | Tool holder | [Local](local-stl/Tools_Holder_v3.stl) | ![show off](images/mods/tool-holder.jpg) |
 | SATSANA Ender 3 - BLTouch (Z-Offset: X-51 ; Y-12) | [Printable](https://www.printables.com/model/58601-satsana-ender3-bltouch-fixed) | ![show off](images/mods/satsana-bltouch-for-hotend.webp) |
+
+# BBT SKR mini E3 v2 pinout
+
+![BBT SKR mini E3 v2 pinout](images/BTT-SKR-mini-E3-v20-pinout.png)