px4-same70xplained-v1:Moved px4-same70xplained-v1 specific README to board dir

src/drivers/boards/px4-same70xplained-v1/README.md

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+## Atmel Same70 Xplained ##
+
+This is the board config that runs on the Atmel Same70 Xplained development board.
+
+http://www.atmel.com/tools/ATSAME70-XPLD.aspx
+
+1. git clone https://github.com/PX4/Firmware.git
+2. git checkout same70xplained
+3. make clean
+4. git submudule update --init --recursive
+5. make px4-same70xplained-v1_default
+
+The ELF file Firmare will be in `build_px4-same70xplained-v1_default/src/firmware/nuttx/`
+
+The EFL file name is `firmware_nuttx`
+
+Pin out Same70 Xplained development board is:
+![Same70 Xplained development board](https://cloud.githubusercontent.com/assets/1945821/15483794/615ff9ec-20d2-11e6-918b-628dc52374fe.png "Pinout on Same70 Xplained development board")
+May-3-2016 Changes are highlited in orange
+May-23-2016 Changes are highlited in Blue
+
+![Drotek UBLOX NEO-M8N GPS + HMC5983 COMPASS (XL) - wiring](https://cloud.githubusercontent.com/assets/1945821/15004599/b249859a-1154-11e6-8e54-4af891f9cf85.png)
+
+![DroTek MPU9250 - wiring](https://cloud.githubusercontent.com/assets/1945821/15484096/f5b8336a-20d3-11e6-80f3-2b4f9dc3f120.png)