Expand the README

README.md

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-# template-compstate
-Template compstate for use with SRComp.
+# Template Compstate
+
+A template [compstate][compstate] for use with SRComp.
+
+This can be used as the starting point for a new compstate using GitHub's
+feature to [create a new repository from a template][repo-from-template].
+This template includes many of the files which would otherwise need setting up
+by hand when [preparing for a new competition][comp-prep].
+
+[compstate]: https://srcomp.readthedocs.io/en/latest/compstate.html
+[repo-from-template]: https://docs.github.com/en/repositories/creating-and-managing-repositories/creating-a-repository-from-a-template
+[comp-prep]: https://github.com/PeterJCLaw/srcomp/wiki/Competition-Preparation