[Keyboard] add mlego/m65 oled revision (#15833)

keyboards/mlego/m65/readme.md

@@ -6,7 +6,7 @@ A  (13x5) ortholinear keyboard that can be hand wired or using a pcb.
 
 * Keyboard Maintainer: [Alin Elena](https://github.com/alinelena) ([@drFaustroll on GitLab](https://gitlab.com/drFaustroll))
 * Hardware Supported: custom pcb [see](https://gitlab.com/m-lego/m65) STM/APM32F103C8T6, aka Black Pill (rev1),
-  GD32F303CCT6 from we act aka Blue Pill Plus (rev2), STM32F401 from we act (rev3)
+  GD32F303CCT6 from we act aka Blue Pill Plus (rev2), STM32F401 from we act (rev3,rev4) STM32F411 can also be used just ask
 * Hardware Availability: [custom how to](https://alin.elena.space/blog/keeblego/)
 
 
@@ -42,6 +42,17 @@ Flashing example for this keyboard:
 
 To enter flashing mode, on microcontroller keep pressed BOOT0 and then NRST, release NRST and then after 0.5s or so  release BOOT0.
 
+For rev4
+
+    make mlego/m65/rev4:default
+
+Flashing example for this keyboard:
+
+    make mlego/m65/rev4:default:flash
+
+To enter flashing mode, press in the same time, LWR+RSE+r, alternatively on microcontroller keep pressed BOOT0 and then NRST, release NRST and then after 0.5s or so  release BOOT0.
+
+
 
 See the [build environment setup](https://docs.qmk.fm/#/getting_started_build_tools) and the [make instructions](https://docs.qmk.fm/#/getting_started_make_guide) for more information. Brand new to QMK? Start with our [Complete Newbs Guide](https://docs.qmk.fm/#/newbs).
 
@@ -127,3 +138,35 @@ the pinout is the same for stm32f411
 | SCROLL_LOCK | B13 |
 | RBG_DI      | B15 |
 
+## Pins and leds rev4 stm32f401
+
+the pinout is the same for stm32f411
+
+| Rows  | C0    | C1    | C2    | C3    | C4    | C5    | C6    | C7    | C8    | C9    | C10   | C11   | C12   | Pins  |
+| :---: | :---: | :---: | :---: | :---: | :---: | :---: | :---: | :---: | :---: | :---: | :---: | :---: | :---: | :---: |
+| R0    | Esc   | 1     | 2     | 3     | 4     | 5     | 6     | 7     | 8     | 9     | 0     | -     | Bksp  | B10   |
+| R1    | Tab   | q     | w     | e     | r     | t     | y     | u     | i     | o     | p     | [     | ]     | A5    |
+| R2    | #     | a     | s     | d     | f     | g     | h     | j     | k     | l     | ;     | '     | Enter | A6    |
+| R3    | Shift | \     | z     | x     | c     | v     | b     | n     | m     | ,     | .     | Up    | /     | A7    |
+| R4    | Ctrl  | Menu  | Lower | Alt   | Raise | Space | Space | Space | AltGr | Shift | Left  | Down  | Right | B0    |
+|       | B14   | A8    | A10   | A15   | B3    | B4    | B5    | B7    | A1    | A2    | A3    | A4    | B1    |       |
+
+### Encoders
+
+  - Pad_A: A0
+  - Pad_B: B6
+
+### Oled
+
+  - SDA: B9
+  - SCL: B8
+
+### LEDS
+
+| Leds        | Pin |
+| ----------- | --- |
+| NUM_LOCK    | B12 |
+| CAPS_LOCK   | C13 |
+| SCROLL_LOCK | B13 |
+| RBG_DI      | B15 |
+