Added a missing section

Author: egonw

appfileformats.i.md

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+<section label="fileformats" level="##">File Formats</section>
+
+This appendix lists of file formats the CDK knows about. For each format, it indicated if
+the CDK has a reader (R) and/or a writer (W) for it. It also indicates which formats can
+be detected from the file content. Chemical file format definitions implementations in
+the CDK implement the <class>IChemFormatMatcher</class> class for that.
+
+This script was used to create this list:
+
+<code>ListAllFileFormats</code>
+
+<table>
+<tr>
+  <td><b>Read/Write</b></td>
+  <td><b>Matcher</b></td>
+  <td><b>File Format</b></td>
+</tr>
+<in>fileformatlist.md</in>
+</table>
+
+## The Readers and Writers
+
+Additionally, for all formats we can list information about the readers and writers, again
+by iterating over all formats:
+
+<code>ListAllIOClassesByFormat</code>
+
+<input>ioclasseslist.md</input>