Add dataset metadata

dataset_metadata.json

@@ -0,0 +1,33 @@
+{
+  "dataset_info": {
+    "description": "Datasets for training Two-Tower models",
+    "citation": "@article{msmarco, title={MS MARCO: A Human Generated MAchine Reading COmprehension Dataset}, author={Nguyen, Tri and Rosenberg, Matthew and Song, Xia and Gao, Jianfeng and Tiwary, Saurabh and Majumder, Rangan and Deng, Li}, journal={arXiv preprint arXiv:1611.09268}, year={2016}}",
+    "homepage": "https://huggingface.co/datasets/mlx7-two-tower-data",
+    "license": "mit",
+    "features": {
+      "q_text": {
+        "dtype": "string",
+        "description": "Query text"
+      },
+      "d_pos_text": {
+        "dtype": "string",
+        "description": "Positive (relevant) document text"
+      },
+      "d_neg_text": {
+        "dtype": "string",
+        "description": "Negative (non-relevant) document text"
+      }
+    },
+    "splits": {
+      "train": {
+        "name": "train",
+        "num_examples": "varies by dataset",
+        "dataset_files": [
+          "classic_triplets.parquet",
+          "intra_query_neg.parquet",
+          "multi_pos_multi_neg.parquet"
+        ]
+      }
+    }
+  }
+}