adds installation instructions for idf.py

Author: zackees

README.md

@@ -16,6 +16,22 @@
 - UI / Widgets : [LVGL 8.x](https://github.com/lvgl/lvgl)
 - Framework : [ESP-IDF](https://github.com/espressif/esp-idf/)
 
+
+## idf.py
+
+Install `idf.py` toolset by using the guide:
+
+  * Linux/Mac:
+    * https://docs.espressif.com/projects/esp-idf/en/latest/esp32/get-started/linux-macos-setup.html
+  * Windows:
+    * https://docs.espressif.com/projects/esp-idf/en/latest/esp32/get-started/windows-setup.html
+
+On mac/linux activat the `idf.py` environment by using:
+
+  * `. ~/esp/esp-idf/export.sh`
+
+The `idf.py` tool should now be available.
+
 ## Screens
 1. HOME (you can add more widgets here)
 2. REMOTE (Sample App screen where you can have your own)
@@ -217,4 +233,3 @@ message(STATUS "---------------------------------------")
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-