Item Search - align required endpoints

[aznan2]

In the current README.md for Item Search it says:

Implementing GET /search is required, POST /search is optional, but recommended.

At the same time, the openapi.yaml says for GET:

This method is optional, but you MUST implement POST /search if you want to implement this method.

And for POST:

This method is mandatory to implement if GET /search is implemented.

Which of these are true?

[philvarner]

Implementing GET /search is required, POST /search is optional, but recommended. is correct