Add collection of "all" AI features

[koppor]

Triggered by a private conversation.

This is a try to provide some orientation point to document AI code in JabRef

Mandatory checks

• I own the copyright of the code submitted and I license it under the MIT license
• [/] I manually tested my changes in running JabRef (always required)
• [/] I added JUnit tests for changes (if applicable)
• [/] I added screenshots in the PR description (if change is visible to the user)
• [/] I described the change in CHANGELOG.md in a way that is understandable for the average user (if change is visible to the user)
• [/] I checked the user documentation: Is the information available and up to date? If not, I created an issue at https://github.com/JabRef/user-documentation/issues or, even better, I submitted a pull request updating file(s) in https://github.com/JabRef/user-documentation/tree/main/en.

[ThiloteE]

Where exactly is the section "References"? Can we add a link there? Is this supposed to refer to something in the UI of JabRef or something in the code of JabRef or something in the JabRef documentation?

[InAnYan]

It's the in a paper

[koppor]

I linked https://devdocs.jabref.org/glossary/references.html - maybe we can refine that text with screenshots etc.