Add AppStream metadata

freedesktop/ca.victorz.acr.AssaultCubeReloaded.appdata.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<component type="desktop">
+  <id>ca.victorz.acr.AssaultCubeReloaded</id>
+  <metadata_license>CC0-1.0</metadata_license>
+  <project_license>Zlib</project_license>
+  <developer_name>AssaultCube Reloaded Task Force</developer_name>
+  <name>AssaultCube Reloaded</name>
+  <summary>First-person-shooter game</summary>
+  <description>
+    <p>The game offers fast paced gameplay just like its predecessor AssaultCube. Improvements over the original game include:</p>
+    <ul>
+      <li>New, diverse game modes and mutators</li>
+      <li>Many new and different weapons</li>
+      <li>More realistic gameplay: damage fading over distance, bleeding, drowning</li>
+      <li>Ricochet shots (bouncing bullets)</li>
+      <li>Chat easily visible, separated from the main console</li>
+      <li>Less potential cheats (more server-sided code)</li>
+      <li>Better voting system: ignore neutral votes, veto admin votes after second press</li>
+      <li>Improved radar showing explosions and shotlines</li>
+      <li>Killfeed making it easy to see kills</li>
+      <li>Spawn enqueue/dequeue—no need to spam the spawn button</li>
+    </ul>
+  </description>
+  <url type="homepage">https://acr.victorz.ca/</url>
+  <url type="bugtracker">https://github.com/acreloaded/acr/issues</url>
+  <screenshots>
+    <screenshot type="default">
+      <image type="source">https://a.fsdn.com/con/app/proj/assaultcuber/screenshots/1.png</image>
+    </screenshot>
+    <screenshot>
+      <image type="source">https://a.fsdn.com/con/app/proj/assaultcuber/screenshots/2.png</image>
+    </screenshot>
+    <screenshot>
+      <image type="source">https://a.fsdn.com/con/app/proj/assaultcuber/screenshots/3.png</image>
+    </screenshot>
+    <screenshot>
+      <image type="source">https://a.fsdn.com/con/app/proj/assaultcuber/screenshots/4.png</image>
+    </screenshot>
+    <screenshot>
+      <image type="source">https://a.fsdn.com/con/app/proj/assaultcuber/screenshots/5.png</image>
+    </screenshot>
+    <screenshot>
+      <image type="source">https://a.fsdn.com/con/app/proj/assaultcuber/screenshots/6.png</image>
+    </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 version="v2.18.2" date="2021-01-07" type="stable">
+      <url>https://github.com/acreloaded/acr/releases/tag/v2.18.2</url>
+    </release>
+  </releases>
+  <launchable type="desktop-id">ca.victorz.acr.AssaultCubeReloaded.desktop</launchable>
+</component>

freedesktop/ca.victorz.acr.AssaultCubeReloaded.desktop

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+[Desktop Entry]
+Version=1.0
+Type=Application
+Exec=acreloaded
+Terminal=false
+Name=AssaultCube Reloaded
+GenericName=Realistic Multiplayer FPS
+Icon=ca.victorz.acr.AssaultCubeReloaded
+StartupNotify=false
+Categories=Game;ActionGame;