Add dataset info

dataset_info.json

@@ -0,0 +1,25 @@
+{
+  "dataset_name": "dsir-pile-13m-filtered-no-github-or-dm_mathematics",
+  "dataset_size": 12782200,
+  "download_size": "unknown",
+  "features": {
+    "text": {
+      "dtype": "string"
+    },
+    "metadata": {
+      "pile_set_name": {
+        "feature": {
+          "dtype": "string"
+        },
+        "length": -1
+      }
+    }
+  },
+  "splits": {
+    "train": {
+      "name": "train",
+      "num_bytes": "unknown",
+      "num_examples": 12782200
+    }
+  }
+}