Create README.md

Added a README.md.

README.md

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+---
+configs:
+- config_name: default
+  data_files:
+  - split: train
+    path: catalogs_for_annotation.json
+  default: true
+license: cc-by-4.0
+task_categories:
+- text-classification
+language:
+- de
+tags:
+- legal
+pretty_name: Auxiliary Dataset for a Swiss Sustainable Procurement Analysis & Reporting Kit
+size_categories:
+- n<1K
+---
+
+# <font color="red">⚠️ Caution: The dataset is subject to continuous changes. We are currently actively developing it.</font>
+
+# Dataset Card: Auxiliary Dataset for a Swiss Sustainable Procurement Analysis & Reporting Kit
+
+## Dataset Description
+
+This dataset contains a specific snapshot of the sustainability procurement criteria catalogs available at [IntelliProcure/sustainability_criteria](https://huggingface.co/datasets/IntelliProcure/sustainability_criteria). This version was used to annotate Swiss calls for tender, which form the core of the [IntelliProcure/SwissSPARK](https://huggingface.co/datasets/IntelliProcure/SwissSPARK) dataset. Users working with [IntelliProcure/SwissSPARK](https://huggingface.co/datasets/IntelliProcure/SwissSPARK) are advised to use this specific catalog version to ensure consistency, as newer iterations may differ from those used in the original annotation.