Update README.md

Author: aaronkaplan

004/README.md

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 # IEP04 - Internal Data Format: Meta Information and Data Exchange
 
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+## Status
+Decided and formalized via [JSON Schema](schema/schema.json)
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+## Contents
 Authors: Pavel Kacha (CESNET.cz), Sebastian Wagner (CERT.at), Sebastian Waldbauer (CERT.at), Aaron Kaplan (CERT.at)
 
 To ease data exchange between two or more IntelMQ instances, adding some meta-information to the messages can make this sharing easier in certain regards.