Add Feather M0 Express info

_board/feather_m0_express.md

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+---
+layout: download
+board_id: "feather_m0_express"
+title: "Feather M0 Express Download"
+name: "Feather M0 Express"
+manufacturer: "Adafruit"
+board_url: "https://www.adafruit.com/product/3403"
+board_image: "/assets/images/boards/feather_m0_express.jpg"
+---
+
+The Adafruit Feather M0 Express was one of the first development boards designed for CircuitPython by Adafruit. Unlike the original Feather M0 Basic, it added a NeoPixel status LED and external 2MB SPI Flash for storing CircuitPython code.
+
+It is a great entry into the Feather ecosystem with CircuitPython. However, it is now out performed by the [Feather M4 Express]({{ "/board/feather_m4_express/" | relative_url }}) which has a faster microcontroller with more RAM. The additional RAM allows CircuitPython to load more code all at once than this Feather M0 Express can.
+
+## Tutorials
+* [Feather M0 Express Overview](https://learn.adafruit.com/adafruit-feather-m0-express-designed-for-circuit-python-circuitpython)
+
+## Purchase
+* [Adafruit](https://www.adafruit.com/product/3403)
+* [Digi-Key](https://www.digikey.com/short/p87w83)