Merge branch 'master' of https://github.com/AdaCore/RESSAC_Use_Case

README.md

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 # RESSAC_Use_Case
 A Collaborative Development Assurance Lab
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+Welcome to the RESSAC GitHub,
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+RESSAC is an open project devoted to experimenting new approaches to aeronautic system, software, and hardware development assurance.
+It originated from an FAA initiative named "Streamlining Development Assurance" (November 2015).
+It is hosted by IRT St Exupery (Toulouse FRANCE).
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+As of 01/10/2016 the specification of the use case is available in the UseCaseSpecification directory.
+The other folders are empty.