Update README.md: Revise problem identifiers, solutions, and problem descriptions for clarity and accuracy

Update imo_2025.json: Change problem IDs from underscore to hyphen format for consistency

Fix ID formatting in Problem class: Change separator from underscore to hyphen in the generated ID

Update README.md: Rename 'url' to 'id' and 'answer' to 'solution' in dataset features

Refactor imo_2025.json: Consolidate problem statements and remove markdown files for problems 1-6

Remove imo_2025.jsonl from the repository

Delete imo_2025.jsonl

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initial commit