Create README.md

README.md

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+# FAISS Index
+
+This repository contains a FAISS index split into multiple parts in the `index/` folder.
+
+## Reconstruct the index
+
+```bash
+cat part_* > e5_Flat.index
+````
+
+## Usage
+
+```python
+import faiss
+
+index = faiss.read_index("e5_Flat.index")
+```
+
+## Notes
+
+* All `part_*` files are required.
+* Do not modify the part files before reconstruction.
+