Add dataset card

README.md

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+---
+license: apache-2.0
+task_categories:
+  - text-generation
+language:
+  - en
+tags:
+  - lean4
+  - theorem-proving
+  - code-generation
+  - benchmark
+size_categories:
+  - n<1K
+---
+
+# LeanBench Dataset
+
+A benchmark dataset for evaluating AI systems on Lean 4 theorem proving tasks.
+
+## Dataset Description
+
+This dataset contains 190 tasks extracted from real Lean 4 pull requests.
+
+### Task Format
+
+Each row represents a single task with the following key fields:
+
+| Field | Description |
+|-------|-------------|
+| `task_id` | Unique identifier (e.g., LB-0001) |
+| `task_type` | Type of task (e.g., pr_completion) |
+| `difficulty` | Difficulty level (easy/medium/hard) |
+| `difficulty_score` | Numeric difficulty score |
+| `repo` | Source GitHub repository |
+| `pr_number` | Pull request number |
+| `problem_statement` | Natural language description of the task |
+| `golden_patch` | Expected solution (diff format) |
+| `verification_command` | Command to verify the solution |
+
+### Usage
+
+```python
+from datasets import load_dataset
+
+dataset = load_dataset("foundry-ai/leanbench")
+```
+
+## License
+
+Apache 2.0