Add a note about modifier.idf (#2)

- Add a note about modifier.idf (37dc9e617af2f47e998c00de4a6b359fa8b5f7cb)


Co-authored-by: George <[email protected]>

README.md

@@ -9,6 +9,9 @@ ONNX port of [sentence-transformers/all-MiniLM-L6-v2](https://huggingface.co/sen
 
 Here's an example of performing inference using the model with [FastEmbed](https://github.com/qdrant/fastembed).
 
+> Note:
+This model is supposed to be used with Qdrant. Vectors have to be configured with [Modifier.IDF](https://qdrant.tech/documentation/concepts/indexing/?q=modifier#idf-modifier).
+
 ```py
 from fastembed import TextEmbedding