Add "astree.png" (app icon), "astree.desktop" and "astree.appdata.xml" files

For example, astree.desktop:

[Desktop Entry]
Type=Application
Name=Astree
Exec=astree %f
Icon=astree
Terminal=false
Categories=Graphics;Engineering;Education;
MimeType=application/x-astree;
StartupNotify=true

For example, astree.appdata.xml (created using @probonopd's generator)

<?xml version="1.0" encoding="UTF-8"?>
<component type="desktop-application">
	<id>astree</id>
	<metadata_license>CC0-1.0</metadata_license>
	<project_license>LGPL-3.0</project_license>
	<name>Astree</name>
	<summary>Free open-source optical ray tracing and design software</summary>
	<description>
		<p>Astree software computes and shows the ray-tracing analysis of optical devices, having conical or polynomial surfaces,having reflections, transmissions, stops, analysis of the image quality.</p>
	</description>
	<launchable type="desktop-id">astree.desktop</launchable>
	<url type="homepage">http://edeforas.free.fr/</url>
	<screenshots>
		<screenshot type="default">
			<image>http://edeforas.free.fr/Astree/astree.png</image>
		</screenshot>
	</screenshots>
	<provides>
		<id>astree.desktop</id>
	</provides>
</component>

[probonopd]

me@host:~$ desktop-file-validate astree.desktop 
astree.desktop: hint: value "Graphics;Engineering;Education;" for key "Categories" in group "Desktop Entry" contains more than one main category; application might appear more than once in the application menu

me@host:~$ desktop-file-validate astree.desktop 
astree.desktop: hint: value "Graphics;Engineering;Education;" for key "Categories" in group "Desktop Entry" contains more than one main category; application might appear more than once in the application menu

If this is issue, lets use only Categories=Graphics; (also do not forget to add Comment= entry)

[Desktop Entry]
Type=Application
Name=Astree
Comment=Free open-source optical ray tracing and design software
Exec=astree %f
Icon=astree
Terminal=false
Categories=Graphics;
MimeType=application/x-astree;
StartupNotify=true

[edeforas]

Hello, do we have a Scientific or Hobbying category? ( Graphics is nice anyway) Le dim. 18 août 2019 à 17:40, app4soft <notifications@github.com> a écrit :

…

***@***.***:~$ desktop-file-validate astree.desktop astree.desktop: hint: value "Graphics;Engineering;Education;" for key "Categories" in group "Desktop Entry" contains more than one main category; application might appear more than once in the application menu If this is issue, lets use only Categories=Graphics; — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub <#23?email_source=notifications&email_token=AEBQLG3D5ZW2PJQ6HBCTP7TQFFUPRA5CNFSM4IMSZJ6KYY3PNVWWK3TUL52HS4DFVREXG43VMVBW63LNMVXHJKTDN5WW2ZLOORPWSZGOD4RCQBY#issuecomment-522332167>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AEBQLG4KXQSKJTO5U6COACLQFFUPRANCNFSM4IMSZJ6A> .

do we have a Scientific or Hobbying category? ( Graphics is nice
anyway)

Yes, you could set ANY category (and not only one!), but usually other CAD software use Graphics.

[probonopd]

Please see https://standards.freedesktop.org/menu-spec/latest/apa.html and whatever you do, please check your desktop file with the desktop-file-validate tool to ensure it does not produce errors or warnings. Thanks!