Announce CIUW (#97)

* Update index.md

* Update index.md

announcements/index.md

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+# COSMO/ICON User Workshop
+
+published 30/11/2023
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+
+We announce the COSMO/ICON User Workshop on **12 February 2024** as a physical meeting. It will take place at the airport Radisson Hotel next to MeteoSwiss.
+
+The COSMO/ICON User Workshop is a rather informal one-day event, whose goal is to bring together users and developers of these two models, 
+to share experience and knowledge, and to get insights into some projects involving these models. 
+
+Please register for the workshop by email to _[email protected]_ by **December 18th, 2023**.
+You are strongly encouraged to present a poster or to give a talk at this informal event!  Please include a preliminary title in your email if you plan to do so.
+
+Your contribution could be an overview of activities revolving around these models, 
+a description of a technical problem that you are dealing with at the moment, 
+results from a specific project, or a demonstration of a tool that can be useful for other COSMO/ICON users.
+
+
 # Climate model and climate data workshop
 
 published 09/11/2023