d Add Features page

Co-Authored-By: Llewellyn Falco <isidore@users.noreply.github.com>

Author: claremacrae

doc/Features.md

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+<!--
+GENERATED FILE - DO NOT EDIT
+This file was generated by [MarkdownSnippets](https://github.com/SimonCropp/MarkdownSnippets).
+Source File: /doc/mdsource/Features.source.md
+To change this file edit the source file and then execute ./run_markdown_templates.sh.
+-->
+
+<a id="top"></a>
+
+# Features
+
+
+
+<!-- toc -->
+## Contents
+
+  * [v.x.y.z](#vxyz)
+  * [v.0.0.1](#v001)
+    * [First release.](#first-release)<!-- endtoc -->
+
+## v.x.y.z
+
+## v.0.0.1
+
+### First release.
+
+---
+
+[Back to User Guide](/doc/README.md#top)

doc/mdsource/Features.source.md

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+<a id="top"></a>
+
+# Features
+
+
+
+toc
+
+## v.x.y.z
+
+## v.0.0.1
+
+### First release.
+
+---
+
+[Back to User Guide](/doc/README.md#top)