OSS compliance: add Apache-2.0 legal deliverables (LICENSE/NOTICE/CONTRIBUTING)

CONTRIBUTING.md

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+# Contributing to FinBERT
+
+We would love to have FinBERT improved by your contributions.
+
+## How to contribute
+
+- Found a bug or something wrong in the documentation? Please open an issue on
+  our GitHub repository, or even better, submit a Pull Request with a fix.
+- For larger changes or new directions, please open an issue first to discuss
+  what you would like to change.
+
+## Contributor License Agreement (CLA)
+
+By contributing to this project, you agree to assign copyright of your
+contribution to MIH AI B.V. You confirm that you have the right to assign this
+copyright and that your contribution is your original work (or that you have the
+necessary rights to submit it).
+
+All contributions are made under the terms of the Apache License, Version 2.0.
+
+## Copyright
+
+Copyright © 2026 MIH AI B.V.

NOTICE

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+FinBERT
+Copyright © 2026 MIH AI B.V.
+
+This product includes software developed at MIH AI B.V.
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Third-party attributions
+------------------------
+
+This project incorporates and/or depends on third-party open source software.
+Portions of the data-processing code in finbert/utils.py are adapted from
+Hugging Face's `transformers` library (Apache-2.0).
+
+Dependencies and their licenses (from environment.yml / Dockerfile):
+  - transformers, pytorch_pretrained_bert, nltk  — Apache-2.0
+  - pandas, numpy, scikit-learn, torch, joblib, jupyter, ipykernel, Flask  — BSD-3-Clause
+  - spacy, textblob, flask-cors  — MIT
+  - tqdm  — MPL-2.0 / MIT
+
+All third-party components are distributed under permissive licenses.
+Refer to each project's distribution for the full text of its license.