docs: Clarify PlatformIO configuration purpose and add local setup instructions to README.

Author: Chamath-Adithya

README.md

@@ -401,6 +401,13 @@ pio test -e native
 
 # Format code
 pio run -t format
+
+# Note: If running locally, ensure you have PlatformIO installed.
+# You may need to use a virtual environment if your system manages python packages externally:
+# python3 -m venv venv
+# source venv/bin/activate
+# pip install platformio
+# pio run -e esp32
 ```
 
 ### Code Style

platformio.ini

@@ -1,3 +1,6 @@
+; WiBLE PlatformIO Configuration
+; This file is used for CI/CD and local development/testing of examples.
+
 [env:esp32]
 platform = espressif32
 board = esp32dev