Update README.md

Alasdair Allan · web-flow · commit 9510fa2fc765 · 2021-01-27T23:58:53.000Z
diff --git a/README.md b/README.md
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 # MicroPython Examples
 
-Examples to accompany the "Raspberry Pi Pico Python SDK" book.
+Examples to accompany the "[Raspberry Pi Pico Python SDK](https://datasheets.raspberrypi.org/pico/raspberry-pi-pico-python-sdk.pdf)" book which forms part of the technical documentation published by Raspberry Pi Trading
 
 ## Contributions
 
