Create README.md

Author: mgubi

README.md

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+# TeXmacs Docker image
+
+This repository contains a workflow to generate a Docker image with an installation of TeXmacs.
+Suitable for continuous development. 
+
+Based on `Debian Bookworm` (for the AMD64 architecture), with `git` and `TeXmacs 2.1.4` preinstalled and a lot of other stuff (required by the TeXmacs package).
+See [./Dockerfile] for the precise recipe.
+
+PR & suggestions for improvement are welcome!