Added TMOTORF7 board documentation

docs/boards/Board - TMOTORF7.md

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+# TMOTOR F7
+
+## Description
+An evolution of TMOTOR F4, solves the inability to run bidir DSHOT on first 4 motors without remapping.
+Plug & play connectivity with most popular 4in1 ESCs.
+
+## MCU, Sensors and Features
+
+### Hardware
+  - MCU: STM32F722
+  - IMU: MPU-6000
+  - 6 DSHOT motors outputs
+  - BMP280 SPI
+  - 5 hardware UARTs
+  - Onboard regulator supports up to 6S
+  - Dataflash blackbox
+  - External I2C port
+  - JST-SH 10 pin 4in1 ESC plug
+
+
+## Designers & Maintainers
+T-Motor FPV (https://www.facebook.com/rctigermotor/)
+
+
+
+![TMOTOR F7 top](images/TMOTORF7-TopSide.png)
+![TMOTOR F7 bottom](images/TMOTORF7-BottomSide.png)