Update README.md

crossbario · Aug 4, 2017 · 3b302eb · 3b302eb
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 The ESP32 is a low-power Wifi/BL(E) module priced below 3 US-$.
 
 *to work with the examples posted on this page you first have to install the ESP-SDK on your system following this [guide](https://esp-idf.readthedocs.io/en/v1.0/)*
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+or use a docker image as explained in "docker"