Update README with project details and badge

Added a badge and additional information about the project.

README.md

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 # OpenPuck
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 [![BuyMeACoffee](https://raw.githubusercontent.com/pachadotdev/buymeacoffee-badges/main/bmc-yellow.svg)]([https://buymeacoffee.com/pacha](https://github.com/safijari/openpuck/discussions/211))
 
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 OpenPuck is an opensource firmware for NRF52840 Pro Micro that copycats the Steam Controller 2 Puck and allows emulation of Xbox, Switch, and PS3/4/5 controllers and also includes an independant lizard mode (which can work on UAC prompts/task manager/etc). The Switch and PS3 modes have been verified to work on real consoles and Switch, PS4/5 modes have gyro (and touchpad where available) hooked in. Back 4 buttons are mappable for all emulated modes.
 
 > [!WARNING]