Update README.md

README.md

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 This is SmolLM2-1.7B-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.
+# The Gemma 2 model family, developed by Google, consists of lightweight, open-source models that demonstrate state-of-the-art performance across various tasks.  
+
+This repo covers 2b and 9b gemma2 different size gguf models, which are very applicable for deploying and using in PCs, laptops or mobiles.  
+
+# If you are a Mac user, the following free wonderful AI tools can help you to read and understand PDFs effectively:
+- If you are using Zotero for managing and reading your personal PDFs, [zotero-chatpdf](https://github.com/ljeagle/zotero-chatpdf) is a free plugin which can assist you to chat PDFs effectively by your local SmolLM2-1.7B-Instruct.
+- 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. PS. Click [here](https://awa-ai.lemonsqueezy.com/buy/89be07f8-060d-4a8f-a758-f25352773168) to subscribe or invite friends in ChatPDFLocal MacOS app can earn credits to use freely.