Adding an appdata.xml file

[LyesSaadi]

Hi!

While trying to revive the MenuLibre package in Fedora, I thought I'd create an appdata.xml file. And I see that you already have one for mugshot, so I guess I don't have to explain how it works/why is it needed 😛.

I just stuck to the basics, as I didn't want to go too crazy for an unofficial AppData 😛. Feel free to use the version below as a beginning: But I have to insist on the importance of an AppData file!

<?xml version="1.0" encoding="UTF-8"?>
<component type="desktop">
	<id>menulibre</id>
	<metadata_license>MIT</metadata_license>
	<project_license>GPL-3.0-only</project_license>
	<name>MenuLibre</name>
	<summary>MenuLibre is an advanced FreeDesktop.org compliant menu editor</summary>
	<description>
		<p>
			All fields specified in the FreeDesktop.org Desktop Entry and Menu
			specifications are available to quickly update. Additionally,
			MenuLibre provides an editor for the launcher actions used by
			applications such as Unity and Plank.
		</p>
		<p>
			<em>Features:</em>
		</p>
		<ul>
			<li>A beautiful interface powered by the latest version of GTK+.</li>
			<li>Create new launchers, or modify existing ones with complete control over common settings and access to advanced settings.</li>
			<li>Add, remove, and adjust desktop actions: powerful shortcuts available used by Unity, Xfce, and Pantheon.</li>
			<li>Easily rearrange menu items to suit your needs.</li>
		</ul>
	</description>
	<screenshots>
		<screenshot type="default">
			<image>https://bluesabre.org/content/images/size/w2000/2019/12/menulibre-1.png</image>
		</screenshot>
		<screenshot>
			<image>https://bluesabre.org/content/images/2019/12/menulibre_2014_01.png</image>
		</screenshot>
		<screenshot>
			<image>https://bluesabre.org/content/images/2019/12/menulibre_2014_02.png</image>
		</screenshot>
		<screenshot>
			<image>https://bluesabre.org/content/images/2019/12/menulibre_2014_03.png</image>
		</screenshot>
		<screenshot>
			<image>https://bluesabre.org/content/images/2019/12/menulibre_2014_04.png</image>
		</screenshot>
		<screenshot>
			<image>https://bluesabre.org/content/images/2019/12/menulibre_2014_05.png</image>
		</screenshot>
		<screenshot>
			<image>https://bluesabre.org/content/images/2019/12/menulibre_2014_06.png</image>
		</screenshot>
		<screenshot>
			<image>https://bluesabre.org/content/images/2019/12/menulibre_2014_07.png</image>
		</screenshot>
		<screenshot>
			<image>https://bluesabre.org/content/images/2019/12/menulibre_2014_08.png</image>
		</screenshot>
		<screenshot>
			<image>https://bluesabre.org/content/images/2019/12/menulibre_2014_09.png</image>
		</screenshot>
	</screenshots>
	<url type="homepage">https://bluesabre.org/menulibre/</url>
	<developer_name>bluesabre</developer_name>
</component>

Thank you for this amazing software ❤️!

[bluesabre]

Thanks for the reminder! Added in the above commit.