Add notes about writing content

README.md

@@ -9,7 +9,27 @@ sources.
 
 See [index] for an outline of the course material.
 
+## Authoring content
+
+The content in this repository is processed using [Quarto] in order to
+generate the website seen at https://xcitecourse.org/.
+
+To add content, do this:
+
+- Download and install Quarto from [quarto.org][Quarto].
+- Clone this repository.
+- Add/edit content in the form of `.md`, `.qmd`, or `.ipynb` files.
+- Open a terminal, and run `quarto preview`, which will start a local
+  webserver with a live preview.
+- Once you are satisfied with your changes, commit them, and push them
+  to this repository, or submit a pull request.
+
+Once content  publish workflow will then take care of 
+
 <!-- References -->
 
 [CHESS]: https://www.chess.cornell.edu/
 [index]: ./index.md
+
+[Quarto]: https://quarto.org
+[x-cite]: https://xcitecourse.org/