Add repo landing README

README.md

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+---
+license: cc-by-sa-4.0
+tags:
+- relbench
+- relational-deep-learning
+---
+
+# RelBench v2 databases
+
+[RelBench](https://relbench.stanford.edu) v2 relational databases, each in its own
+subdirectory in the self-describing manifest layout (plain parquet + `manifest.yaml`):
+
+```
+<dataset>/
+  manifest.yaml                 # tables, primary keys, foreign-key graph, val/test timestamps
+  schema.svg                    # ER diagram
+  db/*.parquet                  # relational tables (plain parquet)
+  tasks/<task>/manifest.yaml    # task spec (+ duckdb SQL for `forecast` tasks)
+  tasks/<task>/{train,val,test}.parquet
+```
+
+Load with `relbench.load_dataset("relbench/v2/<dataset>")` /
+`relbench.load_task("relbench/v2/<dataset>", "<task>")`, or read any subdir's parquet
+directly with pandas/duckdb.