Add notice about new development direction for catalog

README.md

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+---
+
+### *:loudspeaker: A new catalog is coming...*
+
+We're working on a newer, leaner, more modular, and more interoperable solution to the same challenge that the current `datalad-catalog` aims to address. This new development is taking place within the broader context of making DataLad datasets interoperable with linked and semantic (meta)data. For more background, see [this issue](https://github.com/psychoinformatics-de/datalad-concepts/issues/115). To keep up to date, follow progress at [`psychoinformatics-de/datalad-concepts`](https://github.com/psychoinformatics-de/datalad-concepts) and [`psychoinformatics-de/shacl-vue`](https://github.com/psychoinformatics-de/shacl-vue). Because of this redirected focus, `datalad-catalog` itself will be downscaled by focusing on maintenance and assessing the priority of new features on a case-by-case basis.
+
+---
 
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