updating readme

README.md

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 Ask questions about the Manual of Patent Examination and Procedure (MPEP)
 
+This tool aims to make the [MPEP](https://www.uspto.gov/web/offices/pac/mpep/index.html) (Manual of Patent Examination and Procedure) more accessible to everyone. The MPEP is what guides patent examiners at the US Patent and Trademark Office ([USPTO](https://www.uspto.gov/)) when they examine patent applications. It is also what guides patent lawyers and patent agents when preparing patent applications for their clients.
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+MPEP-QA uses OpenAI's GPT models and thus you must enter your API key below. The tool is under active development and costs some money if you run it - About $0.10 - $0.20 per question.
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+Checkout the [DEMO](https://huggingface.co/spaces/vsarathy/mpep-qa)
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+Currently can only answer questions about Patentability (chapter 2100)