Add FuriousFPV RacePIT documentation

docs/boards/Board - FF_RacePIT.md

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+# FuriusFPV RacePIT V1.0
+
+## Features
+- Built-in RealPIT for VTX power.
+- More UARTS (Full 6 Uart) for Simultaneous Connections of USB, Runcam Device, GPS, CRFS Rx, Black-box, Bluetooth
+- Selecting Internal 5V or External 5V ESC
+- 2 Port Camera Control and LED Strip for Simultaneous Connections
+- Built-in ESC connector - Clean and Easy to Connect 4-in-1 ESC
+- Use MPU6000 accelerometers and gyroscopes
+- Ultra Simplified OSD Interface w/ No PC Necessary
+- UARTS Connection Options for TBS Smart Audio or Immersion RC Tramp
+- Integrated Soft Mount Silicone Damping for Maximum FC Functionality
+- Inrush Voltage Protection Input & Output via Transient Voltage Suppressor
+- High Quality 5V 1.5A BEC w/ 2S - 6S Voltage Input Range
+- Built In Driver Inverter for SBUS Connection
+- Separate Power Supply for Gyro w/ LDO for Low Noise & High Accuracy
+- Clean and easy to connect VTX have telemetry (Stealth race, Tramp, Unify)
+
+## Hardware
+- STM32F405 main chip
+- Built-in REALPIT for VTX power supply
+- 6 UARTs 
+- Camera control, support foxxer (built-in capacitor) and another camera (without capacitor)
+- LED strip control
+- MPU6000 
+- BEC 5V 1.5A 2-6S 
+- Sbus inverter signal 
+- Built-in OSD AT7456
+- Current sensor support
+- 4 ESCs signal
+
+## BoardLayout
+![RacePIT](images/FF_RacePIT.jpg)
+## Camera Connections
+![RacePIT](images/FF_RacePIT_CAM.jpg)
+## Connections
+![RacePIT](images/FF_RacePIT_Connection.jpg)