Add unified README for OV + ONNX layout

README.md

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+# EmbeddingGemma-300M（OpenVINO + ONNX）
+
+Unified Hugging Face release for IREmbeddingServer / llm-init.
+
+| Subdirectory | Format | MODEL_ID | Key files |
+|--------------|--------|----------|-----------|
+| openvino/ | OpenVINO IR FP32 | embeddinggemma-300m-ov | openvino_model.xml, openvino_model.bin |
+| onnx/ | ONNX FP32 | embeddinggemma-300m-onnx | model.onnx |
+
+Logical model name (OpenAI /v1/models id): embeddinggemma-300m.
+
+## IREmbeddingServer
+
+EMBED_MODEL_DIR must point at the format subdirectory (openvino/ or onnx/), not this repo root.
+
+## llm-init
+
+MODEL_SOURCE=hf://beclab/embeddinggemma-300m
+MODEL_NAME=embeddinggemma-300m
+MODEL_MODE=embedding
+
+## License
+
+Gemma license (see google/embeddinggemma-300m).