Add comprehensive README.md with YAML frontmatter for Hugging Face dataset

README.md

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+title: "IPEDS Graduation Data"
+description: "A comprehensive dataset containing graduation rates and completion data from the Integrated Postsecondary Education Data System (IPEDS) for U.S. higher education institutions."
+tags:
+  - education
+  - graduation-rates
+  - demographics
+  - higher-education
+  - ipeds
+  - completion-rates
+size_categories:
+  - 10M<n<100M
+task_categories:
+  - tabular-classification
+  - text-classification
+language:
+  - en
+pretty_name: "IPEDS Graduation Data"
+configs:
+  - config_name: default
+    data_files:
+      - split: train
+        path: graduation.csv
+    default: true