Adding upstream version 124.0.1.upstream/124.0.1

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

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+# Contributing to libjxl
+
+## Contributing with bug reports
+
+For security-related issues please see [SECURITY.md](SECURITY.md).
+
+We welcome suggestions, feature requests and bug reports. Before opening a new
+issue please take a look if there is already an existing one in the following
+link:
+
+ *  https://github.com/libjxl/libjxl/issues
+
+## Contributing with patches and Pull Requests
+
+We'd love to accept your contributions to the JPEG XL Project. Please read
+through this section before sending a Pull Request.
+
+### Contributor License Agreements
+
+Our project is open source under the terms outlined in the [LICENSE](LICENSE)
+and [PATENTS](PATENTS) files. Before we can accept your contributions, even for
+small changes, there are just a few small guidelines you need to follow:
+
+Please fill out either the individual or corporate Contributor License Agreement
+(CLA) with Google. JPEG XL Project is an an effort by multiple individuals and
+companies, including the initial contributors Cloudinary and Google, but Google
+is the legal entity in charge of receiving these CLA and relicensing this
+software:
+
+  * If you are an individual writing original source code and you're sure you
+  own the intellectual property, then you'll need to sign an [individual
+  CLA](https://code.google.com/legal/individual-cla-v1.0.html).
+
+  * If you work for a company that wants to allow you to contribute your work,
+  then you'll need to sign a [corporate
+  CLA](https://code.google.com/legal/corporate-cla-v1.0.html).
+
+Follow either of the two links above to access the appropriate CLA and
+instructions for how to sign and return it. Once we receive it, we'll be able
+to accept your pull requests.
+
+***NOTE***: Only original source code from you and other people that have signed
+the CLA can be accepted into the main repository.
+
+### License
+
+Contributions are licensed under the project's [LICENSE](LICENSE). Each new
+file must include the following header when possible, with comment style adapted
+to the language as needed:
+
+```
+// Copyright (c) the JPEG XL Project Authors. All rights reserved.
+//
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+```
+
+### Code Reviews
+
+All submissions, including submissions by project members, require review. We
+use GitHub pull requests for this purpose. Consult
+[GitHub Help](https://help.github.com/articles/about-pull-requests/) for more
+information on using pull requests.
+
+### Contribution philosophy
+
+  * Prefer small changes, even if they don't implement a complete feature. Small
+  changes are easier to review and can be submitted faster. Think about what's
+  the smallest unit you can send that makes sense to review and submit in
+  isolation. For example, new modules that are not yet used by the tools but
+  have their own unittests are ok. If you have unrelated changes that
+  you discovered while working on something else, please send them in a
+  different Pull Request. If your are refactoring code and changing
+  functionality try to send the refactor first without any change in
+  functionality. Reviewers may ask you to split a Pull Request and it is
+  easier to create a smaller change from the beginning.
+
+  * Describe your commits. Add a meaningful description to your commit message,
+  explain what you are changing if it is not trivially obvious, but more
+  importantly explain *why* you are making those changes. For example "Fix
+  build" is not a good commit message, describe what build and if it makes sense
+  why is this fixing it or why was it failing without this. It is very likely
+  that people far in the future without any context you have right now will be
+  looking at your commit trying to figure out why was the change introduced. If
+  related to an issue in this or another repository include a link to it.
+
+  * Code Style: We follow the [Google C++ Coding
+  Style](https://google.github.io/styleguide/cppguide.html). A
+  [clang-format](https://clang.llvm.org/docs/ClangFormat.html) configuration
+  file is available to automatically format your code, you can invoke it with
+  the `./ci.sh lint` helper tool.
+
+  * Testing: Test your change and explain in the commit message *how* your
+  commit was tested. For example adding unittests or in some cases just testing
+  with the existing ones is enough. In any case, mention what testing was
+  performed so reviewers can evaluate whether that's enough testing. In many
+  cases, testing that the Continuous Integration workflow passes is enough.
+
+  * Make one commit per Pull Request / review, unless there's a good reason not
+  to. If you have multiple changes send multiple Pull Requests and each one can
+  have its own review.
+
+  * When addressing comments from reviewers prefer to squash or fixup your
+  edits and force-push your commit. When merging changes into the repository we
+  don't want to include the history of code review back and forth changes or
+  typos. Reviewers can click on the "force-pushed" automatic comment on a Pull
+  Request to see the changes between versions. We use "Rebase and merge" policy
+  to keep a linear git history which is easier to reason about.
+
+  * Your change must pass the build and test workflows. There's a `ci.sh` script
+  to help building and testing these configurations. See [building and
+  testing](doc/building_and_testing.md) for more details.
+
+### Contributing checklist.
+
+  * Sign the CLA (only needed once per user, see above).
+
+  * AUTHORS: You can add your name to the [AUTHORS](AUTHORS) file.
+
+  * Style guide. Check `./ci.sh lint`.
+
+  * Meaningful commit description: What and *why*, links to issues, testing
+  procedure.
+
+  * Squashed multiple edits into a single commit.
+
+  * Upload your changes to your fork and [create a Pull
+  Request](https://docs.github.com/en/github/collaborating-with-issues-and-pull-requests/proposing-changes-to-your-work-with-pull-requests/creating-a-pull-request).
+
+# Community Guidelines
+
+This project follows [Google's Open Source Community
+Guidelines](https://opensource.google.com/conduct/).