[quickhelp] Add Music Metadata section

www/quickhelp.html

@@ -27,7 +27,10 @@ <h5>Library</h5>
 			<p>The Cover Art section of Preferences contains settings for specifying cover art resolution, whether to search first for embedded image or cover image file and which audio formats are included.</p>
 			<p>NOTE: Some Albums for example "Nine Inch Nails - The Slip" have a main cover image file and also embedded covers in each track. To display the covers correctly first add the cover image file named so its the last file in the album directory, then set Prefs > "Cover search priority" to "Embedded" and Prefs > "Audio formats" to "Default+"</p>
 		</li>
-		<li><span> Artist and Album Artist</span>
+		<li><span> Music metadata</span>
+			<p>For a list of metadata tags supported by moOde view the <a href="https://github.com/moode-player/docs/blob/main/music_metadata.md" class="target-blank-link" target="_blank">Music Metadata</a> documentation</p>
+		</li>
+		<li><span> Artist and Album Artist tags</span>
 			<p>When the Library is generated it creates a virtual Artist tag that includes Artists, Performers and Conductor, and a virtual Album Artist tag that is set to Album Artist if it exists otherwise to the first element of the virtual Artist tag. The Library section of Preferences contains settings for specifying how to populate the Artist column in Tag view.</p>
 		</li>
 		<li><span> Date tags</span>