Add attribution

README.md

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 # scyllaridae
 
 Any microservice that takes stdin as input and returns a stream to stdout can use scyllaridae to facilitate its execution.
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+## Attribution
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+This is spiritually a fork of the php/symfony implementation at https://github.com/Islandora/crayfish, generalized so new microservices that just need the command arguments set properly on a binary on disk can quickly spin up a new microservice.