This is an attempt to increase the quality of our internal documentation (or, in many cases, ensuring that there is one).

To understand what this is, visit the website of this standard: https://standards.mousepawmedia.com/en/stable/csi.html

In order to close this issue, we need to

• add CSI to contrib guidelines
• add CSI to PR template
• do some initial CSI comments in the project

It will be probably too much work to full on comment the whole project in one go, but whenever we touch a file, we should make sure to comment that in.