Initial aboutcode.federated commit #747

This is an extensive rework of the utilities to compute federated paths
using PURLs.

Author: pombredanne

aboutcode/federated/CHANGELOG.rst

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+Changelog
+=============
+
+
+v0.1.0 (October 20, 2025)
+---------------------------
+
+- Initial release of the ``aboutcode.federated`` library based on
+  original work in the ``aboutcode.hashid`` library.

aboutcode/federated/README.rst

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+aboutcode.federated
+===================
+
+This is a library of utilities to compute ids and file paths for AboutCode
+federated data.
+
+License
+-------
+
+Copyright (c) AboutCode and others. All rights reserved.
+
+SPDX-License-Identifier: Apache-2.0
+
+See https://github.com/aboutcode-org/vulnerablecode for support or download.
+
+See https://aboutcode.org for more information about AboutCode OSS projects.