Document contributing commit message rules

These rules are critical for the readability of our git history. Since I reference these rules often in PRs, they belong at the top of our Contributing section.
payjoin · Feb 21, 2025 · 413ede5 · 413ede5
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@@ -110,6 +110,11 @@ cargo update -p zstd-sys --precise 2.0.8+zstd.1.5.5
 
 ## Contributing
 
+### Commit Messages
+
+The git repository is our source of truth for development history. Therefore the commit history is the most important communication
+artifact we produce. Commit messages must follow [the seven rules in this guide by cbeams](https://cbea.ms/git-commit/#seven-rules).
+
 ### Nix Development Shells
 
 Where nix is available (NixOS or