Add doc/extras.md.

This was in the website repo; now we'll keep it here and copy it over.

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+---
+title: Pandoc Extras
+author: John MacFarlane
+---
+
+This is a curated list of some of the most useful third-party
+software that extends pandoc's capabilities.  For a more
+complete list, see the [Pandoc Extras wiki page]( https://github.com/jgm/pandoc/wiki/Pandoc-Extras).
+
+
+### GUI
+
+  - [PanWriter](https://github.com/mb21/panwriter/#panwriter) is
+    a Markdown editor with live preview that can import and export
+    using pandoc.
+  - [Pandoc Mac OS X
+    Services](https://github.com/mb21/Pandoc-Mac-OS-X-Services)
+    allows you to invoke pandoc from any text editor with the
+    opened file as input.
+
+### Editor support
+
+  - [pandoc-mode](http://joostkremers.github.com/pandoc-mode/) for Emacs
+  - [vim-pandoc](https://github.com/vim-pandoc) for Vim
+
+### CLI wrappers
+
+  - [panzer](https://github.com/msprev/panzer) allows you to
+    specify command-line options and styles in the Markdown file's YAML
+    metadata.
+  - [pandocomatic](https://heerdebeer.org/Software/markdown/pandocomatic/)
+    is similar to panzer but also provides support for
+    converting directory trees.
+  - [panrun](https://github.com/mb21/panrun) is a more
+    minimalistic alternative to panzer and pandocomatic.
+
+### Editing/document changes
+
+  - [pandiff](https://github.com/davidar/pandiff) creates prose
+    diffs for any document format supported by pandoc.
+  - [pancritic](https://github.com/ickc/pancritic) allows using
+    [CriticMarkup](http://criticmarkup.com/spec.php#caveats) with pandoc.
+
+### Charts and data
+
+  - [R Markdown](https://rmarkdown.rstudio.com) allows you to
+    process Markdown documents with integrated data and charts
+    (integrates pandoc).
+  - [pandoc-plot](https://github.com/LaurentRDC/pandoc-plot)
+    allows you to integrate programatically generated plots
+    generated by various tools.
+
+### Citations
+
+  - [zotxt](https://github.com/egh/zotxt) is Zotero extension
+    for working with pandoc
+
+### Numbering and cross-references
+
+  - [pandoc-crossref](https://github.com/lierdakil/pandoc-crossref)
+    is a filter that adds support for figure, table, and
+    equation numbers and cross-references.
+  - [pandoc-xnos](https://github.com/tomduck/pandoc-xnos) is
+    a suite of filters supporting numbering and
+    cross-referencing figures, equations, tables, and sections.
+
+### Academic publishing workflows
+
+  - [Manubot](https://manubot.org) is a workflow and set of tools for the next
+    generation of scholarly publishing, including citation support and
+    support for multiple output formats.
+  - [Pandoc Scholar](https://github.com/pandoc-scholar/pandoc-scholar) is a
+    set of utilities to make publishing of scientific articles as simple and
+    pleasant as possible. It simplifies setting authors' metadata in
+    YAML blocks, allows to add semantic annotation to citations, and
+    only requires the programs pandoc and make.
+
+### Containers
+
+  - [pandoc docker images](https://github.com/pandoc/dockerfiles)
+
+### Lua filters
+
+(For a fuller list, see [the lua-filters
+repository](https://github.com/pandoc/lua-filters).)
+
+  - [Spell
+    checking](https://github.com/pandoc/lua-filters/tree/master/spellcheck)
+  - [Word count](https://github.com/pandoc/lua-filters/tree/master/wordcount).
+  - [Embed textually-specified
+    diagrams](https://github.com/pandoc/lua-filters/tree/master/diagram-generator) in PlantUML, Graphviz, TikZ, and Python.
+  - [Handle scholarly
+    metadata](https://github.com/pandoc/lua-filters/tree/master/scholarly-metadata).
+  - [Panda](http://christophe.delord.free.fr/panda/) provides
+    conditionals, code file inclusion, string expansion,
+    and diagrams from code blocks.
+