add fields info

README.md

@@ -144,7 +144,28 @@ An example from the `image-matching` split:
 
 ### Data Fields
 
-[More Information Needed]
+The fields for the `illustration-detection` config:
+
+- image_id: id for the image
+- height: height of the image
+- width: width of the image
+- image: image of the chapbook page
+- objects: annotations in COCO format, consisting of a list containing dictionaries with the following keys:
+  - bbox: bounding boxes for the images
+  - category_id: a label for the image
+  - image_id: id for the image
+  - iscrowd: COCO is a crowd flag
+  - segmentation: COCO segmentation annotations (empty in this case but kept for compatibility with other processing scripts)
+
+The fields for the `image-classification` config:
+
+- image: image
+- label: a label indicating if the page contains an illustration or not 
+
+The fields for the `image-matching` config:
+
+- image: image of the chapbook page
+- label: an id for a particular instance of an image i.e. the same images will share the same id. 
 
 ### Data Splits
 
@@ -232,10 +253,9 @@ keywords = {illustration detection, chapbooks, image search, visual grouping, pr
 location = {Lausanne, Switzerland},
 series = {HIP '21}
 }
-
 ```
 
 
 ### Contributions
 
-Thanks to [@github-username](https://github.com/<github-username>) for adding this dataset.
+Thanks to [@davanstrien](https://github.com/davanstrien) and Giles Bergel for adding this dataset.