Fill README with useful information

README.md

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 # CodeRefinery train-the-trainer course material
 
+This is the source repository for the CodeRefinery train the trainer workshop, last held in Aug/Sep 2024. 
+
+Sourcecode repository: <https://github.com/coderefinery/train-the-trainer/>
+Rendered pages: <https://coderefinery.github.io/train-the-trainer/>
+
+Please refer to the CITATION.cff (work in progress) file for author and citation information.
+
+This work is licensed under Creative Commons Attribution 4.0 International.
+
+You can build this material locally using Sphinx (see requirements.txt file for needed packages).
+Please refer to the ["CodeRefinery lesson template lesson"](https://coderefinery.github.io/train-the-trainer/lessons-with-git/#sphinx) for further instructions on building this material.
+
+For any questions, please contact support@coderefinery.org.
+
 In 2024 we combined two older versions of the material
-into a new course version. But you can still find the previous
+into a new course version. You can still find the previous
 two versions as we kept them on branches:
-- https://coderefinery.github.io/train-the-trainer/branch/instructor-training/
-- https://coderefinery.github.io/train-the-trainer/branch/community-teaching/
+- <https://coderefinery.github.io/train-the-trainer/branch/instructor-training/>
+- <https://coderefinery.github.io/train-the-trainer/branch/community-teaching/>