⭐ You probably want to just go straight to dists/README.md ⭐
This is a "fork" of optiboot (http://github.com/Optiboot/optiboot) in which I have cleaned up the build and distribution process to create an easy to install setup which covers a wide range of Atmel AVR Microcontrollers.
See dists/README.md for the installation and usage instructions for your specific Arduino IDE Version.
If you want to add support for more chips, start here: DEVELOPERS.md