Update README.md

Author: Jason2866

README.md

@@ -15,14 +15,26 @@ Espressif Systems is a privately held fabless semiconductor company. They provid
 1. [Install PlatformIO](http://platformio.org)
 2. Create PlatformIO project and configure a platform option in [platformio.ini](http://docs.platformio.org/page/projectconf.html) file:
 
-### Development build Arduino 3.1.0+ and IDF 5.3.1+ (build from development branches)
-Support for the ESP32/ESP32solo1, ESP32C2, ESP32C3, ESP32C6, ESP32S2, ESP32S3 and ESP32-H2
+# Usage
+
+## Tasmota release Arduino 3.1.0.241030 and IDF 5.3.1+
+Support for the ESP32/ESP32solo1, ESP32C2, ESP32C3, ESP32C6, ESP32S2, ESP32S3, ESP32-H2 and ESP32-P4
 ```                  
 [platformio]
 platform = https://github.com/tasmota/platform-espressif32/releases/download/2024.11.30/platform-espressif32.zip
 framework = arduino
 ```
+## Hybrid compile: Build customized Arduino IDF libraries
+Adding the new option `custom_sdkconfig` in an `[env]` will compile the Arduino libraries using the sdkconfig settings
+from the framework and adds the changes specified in `custom_sdkconfig`. After the compile run the Arduino project `[env]` is
+compiled with the customized libraries.
 
+Example: Switching off PPP modem support only for `[env:esp32-no-PPP]`
+```
+[env:esp32-no-PPP]
+board = esp32dev
+custom_sdkconfig = '# CONFIG_LWIP_PPP_SUPPORT is not set'
+```
 ## ESP32 Arduino framework
 
 Example: