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

Copilot wants to merge 2 commits intomainFCHXWH823/LLM4ChipDesign:mainfrom

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