Added FreeDesktop.org metadata

source/freedesktop/net.cubers.assault.AssaultCube.appdata.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<component type="desktop">
+  <id>net.cubers.assault.AssaultCube</id>
+  <metadata_license>CC0-1.0</metadata_license>
+  <project_license>Zlib AND LicenseRef-proprietary=https://assault.cubers.net/docs/license.html</project_license>
+  <developer_name>Rapid Viper Productions</developer_name>
+  <name>AssaultCube</name>
+  <summary>Fast arcade first person shooter</summary>
+  <description>
+    <p>AssaultCube is a free, multiplayer, first-person shooter game, based on the CUBE engine.</p>
+    <p>Taking place in realistic environments, with fast, arcade gameplay, it's addictive and fun!</p>
+    <p>With efficient bandwidth usage, it's low-latency and can even run over a 56 Kbps connection. 
+      It's tiny too and on the correct settings, it can even run on old hardware (Pentium III and above).</p>
+  </description>
+  <url type="homepage">https://assault.cubers.net/</url>
+  <url type="bugtracker">https://github.com/assaultcube/AC/issues</url>
+  <screenshots>
+    <screenshot>https://assault.cubers.net/screenshots/screenshots-large/ac_mines_CTF_SMG_large01.jpg</screenshot>
+    <screenshot>https://assault.cubers.net/screenshots/screenshots-large/ac_mines_CTF_SMG_large00.jpg</screenshot>
+    <screenshot>https://assault.cubers.net/screenshots/screenshots-large/ac_complex_DM_SG_large00.jpg</screenshot>
+    <screenshot>https://assault.cubers.net/screenshots/screenshots-large/ac_complex_DM_SR_large00.jpg</screenshot>
+    <screenshot>https://assault.cubers.net/screenshots/screenshots-large/ac_complex_DM_pist_large00.jpg</screenshot>
+    <screenshot>https://assault.cubers.net/screenshots/screenshots-large/ac_complex_DM_gren_large00.jpg</screenshot>
+  </screenshots>
+  <content_rating type="oars-1.1">
+    <content_attribute id="violence-realistic">intense</content_attribute>
+    <content_attribute id="violence-bloodshed">moderate</content_attribute>
+    <content_attribute id="social-chat">intense</content_attribute>
+    <content_attribute id="social-info">mild</content_attribute>
+  </content_rating>
+  <releases>
+    <release date="2022-03-25" version="1.3.0.2" />
+    <release date="2022-01-24" version="1.3.0.1" />
+    <release date="2021-12-04" version="1.3.0.0" />
+  </releases>
+</component>

source/freedesktop/net.cubers.assault.AssaultCube.desktop

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+[Desktop Entry]
+Name=AssaultCube
+GenericName=Multiplayer FPS
+Exec=assaultcube -t
+Icon=net.cubers.assault.AssaultCube
+Terminal=false
+Type=Application
+Categories=Game;ActionGame;