addon.xml

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<addon id="context.trailer" name="Play Trailer" version="1.0.0" provider-name="BigNoid">
  <requires>
    <import addon="xbmc.python" version="2.25.0"/>
  </requires>
  <extension point="kodi.context.item">
    <menu id="kodi.core.main">
      <item library="addon.py">
        <label>32000</label>
        <visible>String.IsEqual(ListItem.dbtype,movie) + !String.IsEmpty(ListItem.Trailer)</visible>
      </item>
    </menu>
  </extension>
  <extension point="kodi.addon.metadata">
    <platform>all</platform>
    <summary lang="en">Play a movie trailer from the context menu in the library.</summary>
    <description lang="en">Adds a context menu entry for movies that have a trailer in the database. Choose windowed or fullscreen play in the settings.</description>
    <license>GNU GENERAL PUBLIC LICENSE. Version 3, 29 June 2007</license>
    <forum></forum>
    <source>https://github.com/BigNoid/context.trailer</source>
  </extension>
</addon>