Adding Chainlit Welcome Screen text

chainlit.md

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+# RAG Pipeline Demo
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+This app uses a LangChain-based RAG pipeline to demonstrate conversational Q&A from PDFs, as part of the AIM AIE2 Midterm Project.
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+Ask me questions about the 10-k filings of Meta Platforms, Inc. for FY 2023.
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+*By Yohan Mathew*