PHP-CSS-Parser
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Add rebasing guidelines to `CONTRIBUTING.md`
These can be copied from https://github.com/MyIntervals/emogrifier/blob/main/CONTRIBUTING.md, with any necessary name changes to match this project rather than that.
This needs improving as per https://github.com/MyIntervals/PHP-CSS-Parser/pull/1220#pullrequestreview-2720974654.