Add implementation

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diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
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+This project is part of the `build2` toolchain; see its
+[Community](https://build2.org/community.xhtml) page for various ways to
+contribute.
+
+The copyright for the code is held by the contributors of the code (see the
+`AUTHORS` file). The code is licensed under permissive open source licensing
+terms (see the `LICENSE` file). When you contribute code to this project, you
+license it under these terms. Before contributing please make sure that these
+terms are acceptable to you (and to your employer(s), if they have rights to
+intellectual property that you create) and that the code being contributed is
+your original creation.
+
+The revision history in the version control system is the primary source of
+authorship information for copyright purposes. If, however, you would like
+to also be noted explicitly, please include the appropriate change to the
+`AUTHORS` file along with your contribution.