Upload README.md with huggingface_hub

README.md

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+# KCC (Konomi Cube Coin) dataset
+
+This dataset is an export of the local `kc.db3` SQLite database.
+
+## Tables exported
+- `chain_blocks`: 3
+- `transactions`: 30
+- `blocks`: 3541
+- `edges`: 1150
+- `vertex_agents`: 8
+
+## How to upload to Hugging Face
+Use `huggingface_hub` or `datasets-cli` to create a dataset repo and push these files.
+
+Example:
+```bash
+pip install huggingface_hub
+huggingface-cli login
+mkdir hf-dataset && cd hf-dataset
+git init
+git remote add origin https://huggingface.co/datasets/<your-username>/kcc
+cp -r ../data/* .
+git add . && git commit -m 'initial kcc export'
+git push origin main
+```