Update README.md

Author: jmallm

README.md

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-Project planning and material repository for the 2025 repoository challenge to
-upload data to a variety of bioimaging repositories.
+# Project planning and material repository for the 2025 repository challenge 
 
-The data uploaded for the challenge can be browsed and searched at
+We invite everybody to contribute to this challenge by providing data sets to be uploaded to a variety of bioimaging repositories. Each participant should know the data well (=good annoatations) and submit the same data set to at least two different databases listed [here](https://fairsharing.org/search?q=imaging&isRecommended=true&page=1).
+
+The aims of this challenge are: **(i)** what issues do you encounter when uploading data, **(ii)** how can you prepare yourself better for this process, e.g. what metadata / data format are required, **(iii)** have examplary data sets for reuse / reanalyze e.g. via galaxy and for testing new tools and **(iv)** get ready for the "close to real life" repo-challenge 2.0. 
+
+We ask each participant to provide an overview in the table below which data sets and repos will be used. In addition a questionnaire will be provided (under construction, link will follow) to share the expierence. A short summary about this challenge is also available on zenodo:(link will follow). 
+
+**Time line**
+
++ Feb 2025: please enter your contribution in the table below as soon as possible
+
++ March 2025: open exchange meeting via zoom
+
++ May 30th 2025: data should be uploaded, accepted and publicly available
+
++ June 15th 2025: return questionnaire
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++ June 2025: wrap-up & open exchange meeting via zoom - planning of repo2.0
+
+
+Eventually, the data uploaded for the challenge can be browsed and searched at
 [https://nfdi4bioimage.github.io/n4bi-repo-challenge-2025/](https://nfdi4bioimage.github.io/n4bi-repo-challenge-2025/).