"description" field for plugin

Fixes #2293

InvenTree/templates/InvenTree/settings/plugin_settings.html

@@ -27,6 +27,11 @@
                 <td>{% trans "Author" %}</td>
                 <td>{{ plugin.author }}{% include "clip.html" %}</td>
             </tr>
+            <tr>
+                <td></td>
+                <td>{% trans "Description" %}</td>
+                <td>{{ plugin.description }}{% include "clip.html" %}</td>
+            </tr>
             <tr>
                 <td><span class='fas fa-calendar-alt'></span></td>
                 <td>{% trans "Date" %}</td>