Added docs

docs/boards/Board - SPEDIXF4.md

@@ -0,0 +1,31 @@
+# SPEDIX F4
+
+## Description
+One of the main considerations while designing the SPEDIX F4 was to provide users the maximum amount of UARTs, as well as motor outputs, while retaining maximum efficiency, a careful choice of pinmap allowed to run 6-8 DSHOT motors off just 2 timers, while breaking out all the 6 UARTs that the STM32F405 provides.
+Timer design favors running multirotor and fixed wing alike.
+Plug & play connectivity to SPEDIX and AIKON 4in1 ESCs,
+
+## MCU, Sensors and Features
+
+### Hardware
+  - MCU: STM32F405
+  - IMU: ICM-20602 or MPU-6000
+  - 6 DSHOT motors outputs, 8 by remapping UART6 as M7 & 8, using just 2 timers
+  - BMP280 SPI
+  - 6 hardware UARTs, UART5 with a controllable inverter for SBUS, USART1 with bidirectional inverter for FPORT/SPORT
+  - Onboard regulator supports up to 6S
+  - Dataflash blackbox
+  - External I2C port
+  - JST-SH 10 pin 4in1 ESC plug
+
+
+## Designers
+Kyle Lee (SPEDIX)
+Andrey Mironov (@DieHertz)
+
+
+## Maintainers
+Andrey Mironov (@DieHertz)
+
+
+![SPEDIX F4 top](images/spedixf4-top.png)