Add dataset card with field descriptions

README.md

@@ -41,3 +41,26 @@ configs:
   - split: train
     path: data/train-*
 ---
+
+# CVE_NVD
+
+A curated dataset of 200 CVE vulnerability instances from the National Vulnerability Database (NVD), enriched with exploit PoCs, developer patches, bug reports, sanitizer reports, and GitHub issue context.
+
+## Dataset Fields
+
+| Field | Description |
+|-------|-------------|
+| `instance_id` | Unique identifier (e.g., `njs.cve-2022-32414`) |
+| `description` | CVE description from NVD |
+| `exploit(poc)_url` | URL to exploit or proof-of-concept |
+| `patch_url` | URL to the developer's patch commit |
+| `weakness_enumeration` | CWE classification |
+| `github_repo` | GitHub repository (owner/repo) |
+| `base_commit` | Base commit hash (pre-patch) |
+| `developers_patch` | Full diff of the developer's fix |
+| `bug_report` | Bug report text |
+| `sanitizer_report` | ASAN/MSAN/UBSAN/TSAN sanitizer output |
+| `sanitizer` | Sanitizer type used |
+| `github_issue` | Full GitHub issue text |
+| `nvd_url` | Link to the NVD entry |
+| `minimized_patch` | Minimized version of the developer's patch |