v1.6.0

Features:

• Translate ESP32 sketch comments to English for international accessibility
• Add comprehensive README documentation for all demo sketches
• Improve library documentation with detailed setup instructions
• Update library version to 1.6.0

Changes:

• FullFeaturedDemo_ESP32.ino: Complete Japanese to English comment translation
• FullFeaturedDemo_ESP32_oled.ino: Complete Japanese to English comment translation
• Added README.md and README_EN.md for all demo examples
• Updated library.properties to version 1.6.0
• Enhanced documentation with PIN configurations and usage examples
• FullFeaturedDemo_ESP32_oled_OTA.ino: Newly added