Add 'Seeed Wio Terminal/README.md'

Seeed Wio Terminal/README.md

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+# Overview
+Mainly, it is best to use this board with Arduino. It can run CircuitPython, but this eliminates the Wireless connectivity (WiFi and Bluetooth). 
+
+# Arduino Environment
+There are few steps needed to get the Wio terminal up and running in Arduino.
+- Go to File -> Preferences, and add the following URL to the list of boards
+- `https://files.seeedstudio.com/arduino/package_seeeduino_boards_index.json`
+- Go to Tools -> Board -> Board Manager and find Seeed Wio Terminal
+- Select board from the list