docs: add Valthrun PUBG gameplay enhancer link to README.md

Author: NeverSightAI

README.md

@@ -3239,6 +3239,7 @@ npx skills add https://github.com/gmh5225/awesome-game-security --skill reverse-
 - https://github.com/gmh5225/PUBG-DX
 - https://github.com/gmh5225/PUBGSTAR
 - https://github.com/a0yark/Pubg-demo [External]
+- https://github.com/Valthrun/Valthrun_PUBG [External read-only kernel-based gameplay enhancer in Rust; requires Zenith driver; radar/ESP/health/distance]
 
 > Game:PUBG Lite
 - https://github.com/gmh5225/Pubg-Lite-ESP