Updates the README with info about 'ESP-IDF v4.x build' GitHub Action

CalinRadoni · Dec 26, 2020 · 0fa23b3 · 0fa23b3
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 GitHub Action to install Espressif IoT Development Framework v4.x for building ESP32 code.
 
+**Note:** [ESP-IDF v4.x build](https://github.com/marketplace/actions/esp-idf-v4-x-build) is faster to use as a GitHub Action for
+building ESP32 code. It uses Espressif's official Docker container skipping the whole installation part.
+
 The usable ESP-IDF versions are:
 
 - `latest` (based on release/v4.2)