update links in readme

README.md

@@ -73,10 +73,10 @@ A dataset in a [nixietune](https://github.com/nixiesearch/nixietune) compatible
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-This is the expanded version of the [Amazon ESCI small-en](todo) dataset with the following additions:
+This is the expanded version of the [Amazon ESCI small-en](https://github.com/amazon-science/esci-datarrf) dataset with the following additions:
 * for all queries, extra 32 negatives were genererated
-* negative generation was done with a [RRF](todo)-based hybrid search, mixing the BM25 score with cosine-similarity based on [intfloat/e5-base-v2] emnbedding model.
-* can be loaded with [HF datasets](todo) directly.
+* negative generation was done with a [RRF](https://www.elastic.co/guide/en/elasticsearch/reference/current/rrf.html)-based hybrid search, mixing the BM25 score with cosine-similarity based on [intfloat/e5-base-v2] emnbedding model.
+* can be loaded with [HF datasets](https://huggingface.co/docs/datasets/index) directly.
 
 ## Usage