feat: LLM4Code 2025 program info

Author: natedingyifeng

program.md

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 permalink: /program/
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-TBA
+LLM4Code 2025 program is availabe on [ICSE 2025 website](https://conf.researchr.org/program/icse-2025/program-icse-2025/?track=LLM4Code).
 
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