Update README.md

README.md

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-license: cc-by-4.0
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+---
+license: cc-by-4.0
+task_categories:
+- image-segmentation
+- image-feature-extraction
+language:
+- en
+tags:
+- chemistry
+size_categories:
+- 1K<n<10K
+---
+
+The dataset consists of CC-BY-4.0 licensed open access papers and the annotations on-top are provided under the same licence. Train, test and validation splits are provided as separate folders containing the image files and a single json file containing the annotations in COCO format.
+
+The classes are close to the [https://huggingface.co/datasets/yifeihu/TFT-ID-1.0-coco](TFT-ID) dataset and extend into 3 chemistry specific labels. `chem_reaction` contains everything with reaction arrows, `chem_structures` are structural formulas without reactions and `chem_table` is used for tables containing structural formula.
+
+The dataset is also available on [https://app.roboflow.com/elstner-analytics/ttfc/2](Roboflow), allowing to directly convert the annotatios into different formats.