docs: add note about requiring actual model file

Added clarification that users need an actual .tflite/.h5/.onnx/.keras
model file, not just the placeholder path.

Author: me-jain-anurag

README.md

@@ -78,6 +78,8 @@ edgeflow --help
 
 Create a file `my_config.ef` in the project root directory:
 
+> **Note:** You'll need an actual TensorFlow Lite model file (`.tflite`). You can also use `.h5`, `.onnx`, or `.keras` format models.
+
 ```
 model = "path/to/your/model.tflite"
 output = "optimized_model.tflite"
@@ -254,4 +256,4 @@ See [CONTRIBUTING.md](CONTRIBUTING.md) for detailed guidelines on how to contrib
 This project is licensed under the Apache License 2.0 - see the [LICENSE](LICENSE) file for details.
 
 ## Security Notes
-This project is licensed under the Apache License 2.0 - see the [LICENSE](LICENSE) file for details.
+This project is licensed under the Apache License 2.0 - see the [LICENSE](LICENSE) file for details.