TASK: Remove the WIP not in the readme

Readme.md

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 # Neos Meta Data Extractor Package
 This package handles extraction of meta data from assets. 
 
-**Note: This package is work in progress. The class structure and interfaces may change a lot over time. The package is not meant for productive use.**
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 The package provides the `ExtractorInterface`. With `isSuitableFor()` the implementing classes decide if they will be used for a specific resource. The `AbstractExtractor` implements a check by media type. Just extend and set `$compatibleMediaTypes` to the possible media type range(s). Returned DTOs are added to a collection and forwarded to the central `MetaDataManger` of the package *Neos.MetaData*.
 
 ## Extractors