Fix directory nesting for 02a task scheduling example

Add .gitkeep to preserve directory structure

Add 02a example: task scheduling with print tasks

Add repo hygiene files

Add 01b example: blinky LED at variable rates

Organize sketches into separate directories for Arduino IDE compatibility

Rename directory from esp32_freertos_01a_blinky_1hz to esp32_freertos_01_blinky

Add files via upload

Update README.md

Initial commit