Add flatpak metadata file

Linux/net.sourceforge.quakespasm.Quakespasm.appdata.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<component type="desktop-application"/>
+<application>
+  <id type="desktop">net.sourceforge.quakespasm.Quakespasm</id>
+  <name>Quakespasm</name>
+  <developer_name>Quakespasm contributors</developer_name>
+  <summary>A modern port of the original Quake engine</summary>
+  <metadata_license>CC0-1.0</metadata_license>
+  <project_license>GPL-2.0-only</project_license>
+  <url type="homepage">https://quakespasm.sourceforge.net/</url>
+  <description>
+    <p>Quakespasm is a *Nix friendly Quake Engine based on the SDL port of the popular FitzQuake.
+      It includes some new features, important fixes, and aims for portability and 64 bit correctness.</p>
+    <p>Features:</p>
+      <ul>
+        <li>Supports Windows, Mac OS X, Linux, other unices.</li>
+        <li>Well tested on both 32 bit and 64 bit platforms.</li>
+        <li>Well tested on both little endian and big endian platforms.</li>
+        <li>OpenGL improvements. In-game resolution changing.</li>
+        <li>Widescreen FOV (field of view) support and automatic Hor+ FOV scaling.</li>
+        <li>Improved sound support. Support for OGG, MP3, Opus and WAV external music files.</li>
+        <li>Improved game controller support using SDL2.</li>
+        <li>Countless bug fixes, security fixes and other improvements.</li>
+        <li>Support for playing the 'Quake 2021 re-release' content</li>
+      </ul>
+    <p>Quakespasm requires a copy of the Quake game data, at the least in the form of the shareware data file
+      pak0.pak. In order to set this up, open (and if necessary create) the directory
+      ~/.var/app/net.sourceforge.quakespasm.Quakespasm/data on your computer and copy the id1 directory
+      from a copy of Quake there. Quakespasm will notify you on startup if it cannot find or access the game data.</p>
+  </description>
+  <screenshots>
+    <screenshot type="default">
+      <image type="source">https://a.fsdn.com/con/app/proj/quakespasm/screenshots/ad_1.png/max/max/1</image>
+      <caption>Arcane Dimensions</caption>
+    </screenshot>
+    <screenshot>
+      <image type="source">https://a.fsdn.com/con/app/proj/quakespasm/screenshots/spasm0000.png/max/max/1</image>
+      <caption>Arcane Dimensions</caption>
+    </screenshot>
+    <screenshot>
+      <image type="source">https://a.fsdn.com/con/app/proj/quakespasm/screenshots/253088.jpg/max/max/1</image>
+      <caption>2021 re-release support</caption>
+    </screenshot>
+    <screenshot>
+      <image type="source">https://a.fsdn.com/con/app/proj/quakespasm/screenshots/spasm0000-2173.png/max/max/1</image>
+      <caption>Horde of Zendar</caption>
+    </screenshot>
+    <screenshot>
+      <image type="source">https://a.fsdn.com/con/app/proj/quakespasm/screenshots/ad_2.png/max/max/1</image>
+      <caption>The Crucial Error</caption>
+    </screenshot>
+    <screenshot>
+      <image type="source">https://a.fsdn.com/con/app/proj/quakespasm/screenshots/ad_7.png/max/max/1</image>
+      <caption>Arcane Dimensions secret level</caption>
+    </screenshot>
+  </screenshots>
+  <categories>
+    <category>Game</category>
+  </categories>
+  <releases>
+    <release version="0.96.1" date="2023-10-07"/>
+  </releases>
+  <content_rating type="oars-1.1">
+    <content_attribute id="violence-fantasy">intense</content_attribute>
+    <content_attribute id="violence-bloodshed">intense</content_attribute>
+    <content_attribute id="violence-desecration">moderate</content_attribute>
+  </content_rating>
+  <update_contact>https://sourceforge.net/projects/quakespasm/support</update_contact>
+</application>

Linux/net.sourceforge.quakespasm.Quakespasm.desktop

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+[Desktop Entry]
+Name=Quakespasm
+Comment=A modernised fork of the Quake engine
+Exec=quakespasm
+Icon=net.sourceforge.quakespasm.Quakespasm
+StartupNotify=true
+PrefersNonDefaultGPU=true
+Terminal=false
+Type=Application
+Categories=Game;Shooter;
+Keywords=quake;first;person;shooter;