ajout d'ecxternal de Llm.php avec la mme focntion qu'un sum

[Xeroxnight]

This is:

• a bugfix
• a new feature
• refactoring
• additional unit tests

Checklist:

• Changes are covered by unit tests
  • Changes are covered by existing unit tests
  • New unit tests have been added
• Code style is respected
• Commit message explains why the change is made (see https://github.com/erlang/otp/wiki/Writing-good-commit-messages)
• CHANGELOG.md contains a short summary of the change and a link to the pull request if applicable
• Documentation is updated as necessary

Why this change is needed?

Provide an explanation of why this change is needed, with links to any Issues (if appropriate).
If this is a bugfix or a new feature, and there are no existing Issues, then please also create an issue that will make it easier to track progress with this PR.

[MarkBaker]

pourquoi?

[timouchee]

j'essaye de rajouter une autre fonction a phpspreadsheet (je parle d'une fonction utilisable sur le tableur)
genre une fonction appeler LLM qui prend entre 1 et 2 parametre et qui pour le moment a la meme fonction qu'un SUM .
quelqu'un pourrait m'aider a y voire plus claire ?