Update README.md with GPU support

Signed-off-by: Andriy Mulyar <andriy.mulyar@gmail.com>

README.md

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 <p align="center">Open-source assistant-style large language models that run locally on your CPU</p>
 
+<p align="center"><strong>New</strong>: Now with Nomic Vulkan GPU support. <a href="https://blog.nomic.ai/posts/gpt4all-gpu-inference-with-vulkan">Learn more</a>.</p>
+
 <p align="center">
 <a href="https://gpt4all.io">GPT4All Website</a>
 </p>