add Endeer 3 Max neo with BTT SKR min e3v3

config/examples/Creality/Ender-3 Max Neo/BigTreeTech SKR Mini E3 3.0/README.md

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+# Ender-3 Max Neo with BigTreeTech SKR Mini E3 V3.0 Configuration
+
+> **⚠️ WARNING: Critical Configuration Notes**
+
+## DIAG Jumpers
+
+> **Warning**
+> Motherboard DIAG jumpers must be removed when using endstops.
+
+Remove these jumpers:
+![DIAG Jumpers](README images/DIAG jumpers.png)
+
+## DWIN_CREALITY_LCD Wiring Modification
+
+> **WARNING!**
+> DWIN_CREALITY_LCD requires wiring modification! See `pins_BTT_SKR_MINI_E3_V3_0.h` for details (replicated below). Requires a custom cable.
+
+```
+        ------                ------
+   ENT | 1  2 | BEEP      5V | 1  2 | GND
+   TX1 | 3  4 |            A | 3  4 | B
+   RX1   5  6 |         BEEP | 5  6   ENT
+     B | 7  8 | A         TX | 7  8 | RX
+   GND | 9 10 | 5V           | 9  10|
+        ------                ------
+  Motherboard EXP1        Screen connector
+```
+As layed out on the physical boards
+
+
+Connect the following pins:
+
+| Motherboard | Screen |
+|-------------|--------|
+| TX1         | RX     |
+| RX1         | TX     |
+| BEEP        | BEEP   |
+| A           | A      |
+| B           | B      |
+| 5V          | 5V     |
+| GND         | GND    |