Add README

README.md

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+# Pokemon Showdown Replay Dataset
+
+A collection of parsed Pokemon Showdown replays organized by format (gen1ou, gen2ou, etc.).
+
+## Structure
+
+Each format is provided as a separate tar.gz file in the data/ directory:
+
+- data/gen1ou.tar.gz - Generation 1 OU format replays
+- data/gen2ou.tar.gz - Generation 2 OU format replays
+...etc.
+
+## Usage
+
+To download and extract a specific format:
+
+```python
+from huggingface_hub import hf_hub_download
+import tarfile
+
+# Download a specific format
+file = hf_hub_download('jakegrigsby/pokemon-replays', 'data/gen1ou.tar.gz')
+
+# Extract
+with tarfile.open(file, 'r:gz') as tar:
+    tar.extractall()
+```