Add MonsterWriter integration to documentation

CHANGELOG.md

@@ -7,6 +7,14 @@ and this project adheres to
 
 ## [Unreleased]
 
+### Added
+
+- `se2thesis` is now also available from
+  [`MonsterWriter`](https://www.monsterwriter.com),
+  a tool that aims for easy writing of academic works.  We mention this in the
+  documentation and also link their website and a YouTube video that
+  demonstrates the usage of `se2thesis` within `MonsterWriter`.
+
 ## [v4.3.4] – 2024–09–19
 
 ### Fixed

se2thesis.dtx

@@ -144,6 +144,19 @@
 % available from some time in autumn 2024.  We will update this documentation
 % accordingly, as soon as the new version is available.
 %
+%\subsection{Availability in MonsterWriter}\label{sec:doc-intro-mosterwriter}
+%
+% Since October 2024, \pkg{se2thesis} is also part of \textsc{MonsterWriter},
+% a graphical tool that assists students to write academic papers.  The
+% \textsc{MonsterWriter} GUI allows to focus on the content of a work and allows
+% to export it in various common publisher styles and formats.
+%
+% The \textsc{MonsterWriter} website
+% \href{https://www.monsterwriter.com}{monsterwriter.com} provides more details
+% on the tool, and a YouTube video
+% (\href{https://youtube.com/watch?v=BWOumwmh18g}{youtu.be/BWOumwmh18g})
+% demonstrates some of the features of their \pkg{se2thesis} integration.
+%
 % \subsection{General Macros}\label{sec:doc-intro-macros}
 %
 % They all have in common one macro, \cs{IfFormatAtLeastTF};