Describe the role of directory contributions/ in README.md

README.md

@@ -245,8 +245,8 @@ Acknowledgements
  [option-slice]:          https://mirrors.ctan.org/macros/generic/markdown/markdown.html#slice                "Markdown Package User Manual"
  [option-table-captions]: https://mirrors.ctan.org/macros/generic/markdown/markdown.html#option-tablecaptions "Markdown Package User Manual"
 
-Contributing
-------------
+Contributing to the Development of Markdown
+-------------------------------------------
 
 Apart from the example markdown documents, tests, and continuous integration,
 which are placed in the `examples/`, `tests/`, and `.github/` directories,
@@ -282,6 +282,14 @@ reproduced by running the `docker build` command on `Dockerfile` (`docker build
  [literate programming]: https://en.wikipedia.org/wiki/Literate_programming "Literate programming"
  [ltxdockit]:            https://ctan.org/pkg/ltxdockit                     "ltxdockit – Documentation support"
 
+Contributed Software
+--------------------
+
+Links to contributed third-party software for the Markdown package are
+available in the `contributions/` directory. The intention is to show
+interesting tools for the Markdown package and to give them wider exposure
+without taking responsibility for their development or maintenance.
+
 Citing Markdown
 ---------------
 

contributions/README.md

@@ -0,0 +1,8 @@
+This directory contains Git submodules with external repositories that have
+been contributed to the Markdown package:
+
+- [book-templates][]: Open-source Markdown LaTeX themes for typesetting books and marketing colaterals
+- [pandoc-to-markdown][]: A proof-of-concept that shows how Pandoc can be integrated with the Markdown package, so that we can typeset and style any document format understood by Pandoc directly from TeX
+
+ [book-templates]: https://github.com/xvrabcov/md-templates
+ [pandoc-to-markdown]: https://github.com/drehak/pandoc-to-markdown