Add files for flatpak package (by riomccloud)

org.srb2.SRB2Kart-Saturn.desktop

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+[Desktop Entry]
+Version=1.0
+Type=Application
+Name=Sonic Robo Blast 2 Kart Saturn
+Comment=A kart racing mod based on the 3D Sonic the Hedgehog fangame Sonic Robo Blast 2
+TryExec=srb2kart.sh
+Exec=srb2kart.sh
+Icon=org.srb2.SRB2Kart-Saturn
+Terminal=false
+Categories=Game;SportsGame;
+Keywords=kart;sonic;racer;multiplayer;doom;
+Actions=OpenGL;Software;
+
+[Desktop Action OpenGL]
+Name=OpenGL renderer
+Exec=srb2kart.sh -opengl
+
+[Desktop Action Software]
+Name=Software renderer
+Exec=srb2kart.sh -software

org.srb2.SRB2Kart-Saturn.metainfo.xml

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+<?xml version="1.0" encoding="UTF-8" ?>
+<!-- Copyright 2023 Flathub maintainers -->
+<component type="desktop-application">
+  <id>org.srb2.SRB2Kart-Saturn</id>
+  <metadata_license>FSFAP</metadata_license>
+  <project_license>GPL-2.0+</project_license>
+  <name>Sonic Robo Blast 2 Kart Saturn</name>
+  <summary>Modded SRB2Kart adding many custom features</summary>
+  <description>
+    <p>
+      A modded net-compatible version of SRB2Kart v1.6 that offers multiple code optimizations, palette rendering, player sprite rotation, base Kart HUD customization, and many more.
+    </p>
+  </description>
+  <launchable type="desktop-id">org.srb2.SRB2Kart-Saturn.desktop</launchable>
+  <screenshots>
+    <screenshot type="default">
+      <image>https://wiki.srb2.org/w/images/a/ac/Srb2kart_title.png</image>
+      <caption>Title screen</caption>
+    </screenshot>
+    <screenshot>
+      <image>https://user-images.githubusercontent.com/15758649/227740700-26e0962b-5572-486c-b633-7d4990d86f89.png</image>
+      <caption>Game modes</caption>
+    </screenshot>
+    <screenshot>
+      <image>https://user-images.githubusercontent.com/1964655/82821921-3d180c00-9ea5-11ea-937b-e1f53fe6c686.png</image>
+      <caption>Game play as Sonic</caption>
+    </screenshot>
+    <screenshot>
+      <image>https://user-images.githubusercontent.com/1964655/82821933-41442980-9ea5-11ea-9146-38998161edae.png</image>
+      <caption>Game play as Tails</caption>
+    </screenshot>
+    <screenshot>
+      <image>https://user-images.githubusercontent.com/1964655/82821966-502adc00-9ea5-11ea-9cbd-274d7adb479e.png</image>
+      <caption>Game play as Eggman</caption>
+    </screenshot>
+    <screenshot>
+      <image>https://user-images.githubusercontent.com/1964655/82821980-5620bd00-9ea5-11ea-9eec-2835ebb2a262.png</image>
+      <caption>Game play as Metal Sonic</caption>
+    </screenshot>
+  </screenshots>
+  <url type="homepage">https://github.com/Indev450/SRB2Kart-Saturn</url>
+  <url type="bugtracker">https://github.com/Indev450/SRB2Kart-Saturn/issues</url>
+  <developer_name>Indev450</developer_name>
+  <provides>
+    <binary>srb2kart</binary>
+  </provides>
+  <releases>
+    <release version="5.1" date="2023-12-20">
+      <description>
+        <p>The complete changelog can be found on the build's GitHub repository.</p>
+      </description>
+      <url>https://github.com/Indev450/SRB2Kart-Saturn/releases/tag/v5.1</url>
+    </release>
+    <release version="5.0" date="2023-12-17">
+      <description>
+        <p>The complete changelog can be found on the build's GitHub repository.</p>
+      </description>
+      <url>https://github.com/Indev450/SRB2Kart-Saturn/releases/tag/v5</url>
+    </release>
+  </releases>
+  <categories>
+    <category>Game</category>
+    <category>SportsGame</category>
+  </categories>
+  <recommends>
+    <control>keyboard</control>
+    <control>gamepad</control>
+  </recommends>
+  <content_rating type="oars-1.1">
+    <content_attribute id="violence-cartoon">moderate</content_attribute>
+    <content_attribute id="language-humor">mild</content_attribute>
+    <content_attribute id="social-chat">intense</content_attribute>
+    <content_attribute id="social-info">mild</content_attribute>
+  </content_rating>
+  <keywords>
+    <keyword>doom</keyword>
+    <keyword>multiplayer</keyword>
+    <keyword>racing</keyword>
+  </keywords>
+</component>