Add comprehensive LLM4ChipDesign poster showcasing three research areas and featured submodules#2

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copilot/fix-2c32cb31-2b92-4d0b-a260-95220c66a25cFCHXWH823/LLM4ChipDesign:copilot/fix-2c32cb31-2b92-4d0b-a260-95220c66a25cCopy head branch name to clipboard