Added CLUE board

_board/clue_nrf52840_express.md

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+---
+layout: download
+board_id: "clue_nrf52840_express"
+title: "CLUE NRF52840 Express Download"
+name: "CLUE NRF52840 Express"
+manufacturer: "Adafruit"
+board_url: ""
+board_image: "clue_nrf52840_express.jpg"
+features:
+  - Display
+  - Wi-Fi
+  - Bluetooth/BTLE
+  - Solder-free Alligator clip
+
+---
+We wanted to build some projects that have a small screen and a lot of sensors. this board has a 1.3″ 240×240 ips tft display, two buttons, and a ton of sensors:
+
+lsm series 9 dof motion, apds9960 light/color/proximity, pdm microphone, humidity, temperature and barometric environmental sensing.
+
+There’s a qwiic/stemmaqt connector for adding more sensors like pm2.5 air quality and others that were too big to fit on the board.
+
+We’ll be primarily using circuitpython for programming it, but it will also work in arduino. and of course, we’d love to see makecode on it!
+
+After designing it, the board was close enough to micro:bit-shape-size that we moved a few parts to make it fit in micro:bit robots and some projects – the nrf52840 is a big upgrade chip and can do stuff like tensorflow lite for microcontrollers, ble central and peripheral, and more.
+
+## Learn More
+* [YouTube](https://youtu.be/uNDqkglM8_Y)
+* [Adafruit Blog](https://blog.adafruit.com/2019/12/24/adafruit-top-secret-december-24-2019-get-a-clue-adafruit-clue/)
+
+## Contribute
+
+Have some info to add for this board? Edit the source for this page [here](https://github.com/adafruit/circuitpython-org/edit/master/_board/{{ page.board_id }}.md).