Add tutorial section

Author: Joseph-Edwards

content/en/homepage/tutorial.md

@@ -0,0 +1,22 @@
+---
+title: "Tutorial"
+header_menu_title: "Tutorial"
+navigation_menu_title: "Tutorial"
+weight: 6
+header_menu: true
+---
+
+All of the above libraries and packages have comprehensive and detailed
+documentation pages for their respective APIs. Additionally, for the [Python][]
+package [libsemigroups_pybind11] and the [GAP][] package [Semigroups][], there
+is a more hands-on tutorial available at
+https://libsemigroups.github.io/tutorial.
+
+This tutorial provides step-by-step examples of how to use many of the
+key algorithms and functions in the two packages.
+
+[libsemigroups]: https://libsemigroups.github.io/libsemigroups/
+[libsemigroups_pybind11]: https://libsemigroups.github.io/libsemigroups_pybind11
+[GAP]: https://www.gap-system.org
+[Semigroups]: https://semigroups.github.io
+[Python]: https://python.org