README: Add release schedule and drop v3.3 from the supported versions
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ESP-IDF is the development framework for Espressif SoCs supported on Windows, Linux and macOS.
+# ESP-IDF Release Support Schedule
+
+![Support Schedule](https://dl.espressif.com/dl/esp-idf/support-periods.svg)
+
+- Please read [the support policy](SUPPORT_POLICY.md) and [the documentation](https://docs.espressif.com/projects/esp-idf/en/latest/esp32/versions.html) for more information about ESP-IDF versions.
+- Please see the [End-of-Life Advisories](https://www.espressif.com/en/support/documents/advisories?keys=&field_type_of_advisory_tid%5B%5D=817) for information about ESP-IDF releases with discontinued support.
+
# ESP-IDF Release and SoC Compatibility
The following table shows ESP-IDF support of Espressif SoCs where ![alt text][preview] and ![alt text][supported] denote preview status and support, respectively. The preview support is usually limited in time and intended for beta versions of chips. Please use an ESP-IDF release where the desired SoC is already supported.
-|Chip | v3.3 | v4.1 | v4.2 | v4.3 | v4.4 | v5.0 | |
-|:----------- |:---------------------: | :---------------------:| :---------------------:| :---------------------:| :---------------------:| :---------------------:|:---------------------------------------------------------- |
-|ESP32 | ![alt text][supported] | ![alt text][supported] | ![alt text][supported] | ![alt text][supported] | ![alt text][supported] | ![alt text][supported] | |
-|ESP32-S2 | | | ![alt text][supported] | ![alt text][supported] | ![alt text][supported] | ![alt text][supported] | |
-|ESP32-C3 | | | | ![alt text][supported] | ![alt text][supported] | ![alt text][supported] | |
-|ESP32-S3 | | | | ![alt text][preview] | ![alt text][supported] | ![alt text][supported] | [Announcement](https://www.espressif.com/en/news/ESP32_S3) |
-|ESP32-H2 | | | | | ![alt text][preview] | ![alt text][preview] | [Announcement](https://www.espressif.com/en/news/ESP32_H2) |
-|ESP32-C2 | | | | | | ![alt text][preview] | |
+|Chip | v4.1 | v4.2 | v4.3 | v4.4 | v5.0 | |
+|:----------- |:---------------------:| :---------------------:| :---------------------:| :---------------------:| :---------------------:|:---------------------------------------------------------- |
+|ESP32 |![alt text][supported] | ![alt text][supported] | ![alt text][supported] | ![alt text][supported] | ![alt text][supported] | |
+|ESP32-S2 | | ![alt text][supported] | ![alt text][supported] | ![alt text][supported] | ![alt text][supported] | |
+|ESP32-C3 | | | ![alt text][supported] | ![alt text][supported] | ![alt text][supported] | |
+|ESP32-S3 | | | ![alt text][preview] | ![alt text][supported] | ![alt text][supported] | [Announcement](https://www.espressif.com/en/news/ESP32_S3) |
+|ESP32-H2 | | | | ![alt text][preview] | ![alt text][preview] | [Announcement](https://www.espressif.com/en/news/ESP32_H2) |
+|ESP32-C2 | | | | | ![alt text][preview] | |
[supported]: https://img.shields.io/badge/-supported-green "supported"
[preview]: https://img.shields.io/badge/-preview-orange "preview"
