Update README.md

additional references
unoseistres · Mar 13, 2019 · ddf18f9 · ddf18f9
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 ## References
 - Make: Wearable Electronics by Kate Hartman ([Read Online](https://proquest.safaribooksonline.com/book/electrical-engineering/9781449336769/firstchapter) via PULibrary)
+- [Arduino Language Reference](https://www.arduino.cc/reference/en/)
+- Some tips on [sewing with conductive thread](https://learn.adafruit.com/conductive-thread/stitching-around-circuit-boards)