Update dataset_info.json

dataset_info.json

@@ -1,9 +1,20 @@
 {
-  "schema": {
-    "fields": [
-      {"name": "png", "dtype": "image"},
-      {"name": "json", "dtype": "json"},
-      {"name": "cls", "dtype": "txt"}
-    ]
+  "description": "OpenMaterial dataset containing images and JSON metadata.",
+  "citation": "",
+  "homepage": "",
+  "license": "CC BY-NC 4.0",
+  "features": {
+    "png": {
+      "dtype": "image",
+      "id": null
+    },
+    "json": {
+      "dtype": "json",
+      "id": null
+    },
+    "cls": {
+      "dtype": "string",
+      "id": null
+    }
   }
 }