Update README.md

Author: Flamethr0wer

README.md

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+# PS4ARDUINO-AVR
 
+A custom AVR core to make HID-capable AVR boards emulate a PS4-compatible controller!
+
+## How to install
+1) In the Arduino IDE, click `File` > `Preferences...` (or do `Ctrl + ,`)
+   
+2) Click on this button at the end of the Settings tab:
+   ![Untitled design - 2025-10-05T171857 458](https://github.com/user-attachments/assets/58d9b945-638c-47d8-951d-d997bbc6b5e2)
+
+3) In the box that opens, paste this into a new line `https://flamethr0wer.github.io/PS4Arduino-AVR/package_ps4arduino_index.json` and click `OK`.
+
+4) Open the boards manager by clicking `Tools` > `Board` > `Boards Manager...` or by doing `Ctrl + Shift + B` (or by clicking the board icon on the left panel of the new IDE).
+
+5) Search for `PS4Arduino` and install the latest version of the package
+
+   <img width="316" height="246" alt="Screenshot 2025-10-05 172736" src="https://github.com/user-attachments/assets/85a3a07f-4cd6-4faa-9ce4-6c5abbc8c813" />
+
+Once the installation finishes, you're good to go! You can now use the [PS4Arduino library](https://github.com/Flamethr0wer/PS4Arduino).