Add README file with dataset details and licensing information for HF

Author: PhilipMay

README-hf.md

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+# Wikipedia 22-12 DE DPR
+
+For details about this dataset please see
+[telekom/wikipedia-22-12-de-dpr](https://github.com/telekom/wikipedia-22-12-de-dpr)
+on GitHub.
+
+## Creator
+
+This data set is compiled and open sourced by [Philip May](https://may.la/)
+of [Deutsche Telekom](https://www.telekom.de/).
+
+## Licensing
+
+### The Code and Documentation
+
+Copyright (c) 2023-2024 [Philip May](https://may.la/), [Deutsche Telekom AG](https://www.telekom.de/)
+
+Licensed under the **MIT License** (the "License"); you may not use this file except in compliance with the License.
+You may obtain a copy of the License by reviewing the file
+[LICENSE](https://github.com/telekom/mltb2/blob/main/LICENSE) in the repository.
+
+### The Wikipedia Texts, Questions and Imperative Questions
+
+The Wikipedia texts are licensed under [CC BY-SA 4.0 Deed](https://creativecommons.org/licenses/by-sa/4.0/deed)
+by the corresponding authors of the [German Wikipedia](https://de.wikipedia.org/). The questions and
+imperative questions are copyright ([CC BY-SA 4.0 Deed](https://creativecommons.org/licenses/by-sa/4.0/deed)) by
+[Philip May](https://may.la/), [Deutsche Telekom AG](https://www.telekom.de/).
+Indication of changes:
+
+- data source is the [Cohere/wikipedia-22-12-de-embeddings](https://huggingface.co/datasets/Cohere/wikipedia-22-12-de-embeddings) dataset on Hugging Face Hub
+- we took `wiki_id`, `title` and `text`
+- did some normalization and filtering
+- and merged the texts to an appropriate token count
+- details can be found in the respective notebooks