Add ApexF7 docs

docs/boards/Board - ApexF7.md

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+# ApexF7
+
+### Features
+
+- STM32F722
+
+- 16 MB of Flash
+
+- USB-C  
+
+- Dual Gyro via SPI (MPU6000 + ICM20602)
+
+- Barometer BMP280 via I2C
+
+- VTX Power Switch
+
+- 10V BEC for VTX and Camera
+
+- CamControl
+
+- OSD
+
+- Bluetooth Connectivity via soldered module (active, when board isnt armed)
+
+- WS2812 LED Output
+
+- SmartAudio/Tramp
+
+- Up to 6s Input
+
+### Connections
+
+| Function      | SolderPad/SilkScreen | Rescource | MCU Pin      | Notes                                  |
+|:-------------:|:--------------------:|:---------:|:------------:|:--------------------------------------:|
+| SBUS          | SBUS                 | RX1       | PA10         | No Inverter                            |
+| DSM2          | TX1                  | TX1       | PA9          | CLI serial_halfduplex = ON             |
+| SmartAudio    | S/A                  | TX5       | PC12         |                                        |
+| F.PORT/S.PORT | F.P                  | TX3       | PC10         | No Inverter                            |
+| ESC Telemetry | TLM                  | TX2       | PA2          | Halfduplex by default / on bottom side |
+| Cam Control   | CC                   |           | PA8          |                                        |
+| Video Output  | VTX                  | -         | -            |                                        |
+| Cam Input     | CAM                  | -         | -            |                                        |
+| WS2812        | LED                  | LED_STRIP | PA15         |                                        |
+| BUZZER        | BZ-/BZ+              | BEEPER    | PB0          |                                        |
+| S1-S4         | M1-M4                |           | PC8/B6/C9/B7 | Motor Outputs on bottom                |
+| UART4         | TX4/RX4              | TX4/RX4   | PA0/PA1      |                                        |
+| UART6         | TX6/RX6              | TX6/RX6   | PC6/PC7      |                                        |
+| VBAT in       | BAT                  | -         | -            | 3S-6S input                            |
+| Current       | CURR                 | -         | PC1          | on bottom                              |
+| SDA           | SDA                  | I2C1_SDA  | PB9          |                                        |
+| SCL           | SCL                  | I2C1_SCL  | PB8          |                                        |
+
+### Picture
+
+![front](images/APEXF7_small_front.png)
+
+![back](images/APEXF7_small_back.png)