Add noop-api entry in top-level README.md

[breedx-splk]

It looks like the noop-api module is missing from the topmost table in the readme. We should add an entry for that.

[cyrille-leclerc]

I think the entry already exists in README.md / provided libraries with the name "No-Op API"

[breedx-splk]

thanks @cyrille-leclerc good call.