Add citation

fishtree-attempt · Jul 15, 2022 · 192b381 · 192b381
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-FIXME: describe how to cite this lesson.
+D. M. Eyers, S. L. R. Stevens, A. Turner, C. Koch and J. Cohen. "Reproducible computational environments using containers: Introduction to Docker".
+Version 2020.09a (4a93bd67aa), September 2020. Carpentries Incubator. https://github.com/carpentries-incubator/docker-introduction