Add contributing guidelines

README.md

@@ -9,6 +9,21 @@ You can find the site at [https://wiki.hyprland.org/](https://wiki.hyprland.org/
 Feel free to open an issue or a PR if you feel anything is necessary.
 Make sure to clearly state the reason for the changes.
 
+Commits should have the form:
+
+`Dir/Page: summary of changes`
+
+Optionally, you can include a longer commit message 2 lines below the commit
+title.
+
+This format makes it easier glance over the commit list and figure out what
+each commit is about.
+
+Additionally, if you make many changes in your PR, it is best to squash them
+into self-contained commits that contain one logical change.
+
+For info about how to squash commits, see [this](https://stackoverflow.com/a/5189600).
+
 ## License
 
-This repository is licensed under the [BSD 3-Clause License](LICENSE).
+This repository is licensed under the [BSD 3-Clause License](./LICENSE).