SPRACINGH7ZERO - Add boards documentation and images.

docs/boards/Board - SPRacingH7ZERO.md

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+# Board - Seriously Pro SP Racing H7 ZERO
+
+The SPRacingH7ZERO flight controller features a 400Mhz H7 CPU that runs twice as fast as the previous generation F7 boards.
+A fast control-loop is what you need for perfect flight performance, the H7 at 400Mhz gives you all the processing power you need.
+
+The SPRacingH7ZERO has integrated OSD (on-screen-display) and single gyro, BMP388 barometer and 2-6SBEC.
+
+Easy to solder! - One entire side of the PCB is dedicated to solder pads.
+ 
+Full details available on the website, here:
+
+http://seriouslypro.com/spracingh7zero
+
+Purchasing boards directly from SeriouslyPro / SP Racing and official retailers helps fund software development.
+
+Shop here: https://shop.seriouslypro.com/sp-racing-h7-zero
+
+## Background
+
+The SPRacingH7ZERO FC is the third STM32H750 based FC to ship with Betaflight.  Like the SPRacingH7NANO and SPRacingH7EXTREME before it, it too uses
+the External Storage (EXST) build system which allows a bootloader to load the flight-controller firmware from external flash.
+
+See the EXST documentation for more details on the EXST system.
+
+## Design Goals
+
+* Easy connection for 2 * 4in1 ESCs for 8 motor outputs.
+* No premium hardware features like Microphone, Audio Mixer, Transponder Circuit, Current Sensor or Dual Gyro - See SPRacingH7EXTREME
+* Cheaper than SPRacingH7EXTREME.
+* No integrated PDB.
+* Single sided PCB. 
+
+## Hardware Features
+
+![SPRacingH7ZERO top](images/spracingh7zero-pcb-top.jpg)
+![SPRacingH7ZERO bottom](images/spracingh7zero-pcb-bottom.jpg)
+
+* STM32H750 CPU, 400MHz inc FPU
+* 128MByte 1GBit NAND flash via QuadSPI
+* Low-noise ICM20602 accelerometer/gyro (connected via SPI)
+* BMP388 Barometer (I2C + interrupt)
+* OSD with customisable layout, profiles and configuration menu system
+* MicroSD card slot (SD/SDHC, upto 32GB) connected via 4-Bit SDIO
+* 2-6S BEC 5V Switching regulator, 1A
+* TVS protection diode
+* Dedicated 500mA VREG for sensors and SD card, with extra filter capacitors
+* Second 500mA VREG for CPU, and other peripherals
+* Buzzer circuitry
+* 8 motor outputs.  All in a row, with signal ground connections.
+* RSSI Analog input.
+* 6 Serial Ports (5x TX+RX + 1x TX only bi-directional)
+* 3 LEDs for 5V, 3V and STATUS (Green, Blue, Red)
+* 37x37mm PCB with 30.5mm mounting hole pattern
+* 4mm mounting holes for soft-mount grommets and M3 bolts
+* MicroUSB socket for configuration and ESC programming
+* Bootable from SD Card or External flash.
+* Supplied with 4x soft-mount grommets.
+* Optionally supplied with 2x Audio/Video cables. (Camera Input, VTX Output)
+* 1x Side-press BOOT button (top mounted)
+* 1x Side-press VTX/Settings button (top mounted)
+* 2x 5V/BATTERY voltage selectors for Camera and VTX outputs
+* Cleanflight and Betaflight logos
+* SP Racing logo
+* Additional easter-eggs!
+
+## Connection Diagrams
+
+Connection diagrams can be found on the website, here:
+
+http://seriouslypro.com/spracingh7zero#diagrams
+
+
+## Manual
+
+The manual can be downloaded from the website, here:
+
+http://seriouslypro.com/files/SPRacingH7ZERO-Manual-latest.pdf
+