Update README.md

Author: smalinin

README.md

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 # WebLLM-Tools-Sample
 Sample of using tools with WebLLM (Note it works only in browsers with WebGPU support and you must have at last 4Gb of free VRAM)
+Tested on Chrome and Brave on MSWindows and macOS
 
 [Demo App](https://openlinksoftware.github.io/WebLLM-Tools-Sample/src/index.html)