Update README.md

README.md

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 - chatpdf
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 This is Phi-3.5-mini-instruct GGUF format model, which can be easily runned on PCs, mobile phones or devices with llama.cpp.  
-If you are a Mac user, you can download the beautiful ChatPDFLocal MacOS app from here, load one or batch PDF files at will, and quickly experience the effect of the model through chat reading.  
-Subscription or inviting friends can earn credits to use freely. 
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+If you are a Mac user, you can download the beautiful ChatPDFLocal MacOS app from [here](https://www.chatpdflocal.com), load one or batch PDF files at will, and quickly experience the effect of the model through chat reading.
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+Subscription or inviting friends in ChatPDFLocal MacOS app can earn credits to use freely.