readme : add FreeChat (ggerganov#4248)

README.md

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 <h1 align="center">Custom Frontend for llama.cpp Server</h1>
 
 **This is a fork, but it adresses only the UI of the server. This work will maybe become merged against the upstream. In that case this repo will eventually become to something like a playground for quick and dirty experiments and tinkerings, while the merged frontend at ggerganov/llama.cpp will be a stable and well maintained version**
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   <img src="media/gui-1_main.jpg" width="600" />
 
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   <img src="media/gui-2_options.jpg" width="600" />
 
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