Add archived note

Author: t-sommer

README.md

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 # FMI Cross-Check
 
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+:construction: **This repository is temporarily archived while we're reworking the FMI Cross-Check process.**
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 This repository contains the exported FMUs and results for imported FMUs of the tools that take part in the FMI Cross-Check.
 If your tool is listed on [fmi-standard.org/tools/](https://fmi-standard.org/tools/) you can add your FMUs and results by following the steps below.
 For details see the official [FMI Cross-Check rules](FMI-CROSS-CHECK-RULES.md).