add flatpak metadata

flatpak/org.zulianc.jminos.metainfo.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<component type="desktop-application">
+  <id>org.zulianc.jminos</id>
+  <launchable type="desktop-id">org.zulianc.jminos.desktop</launchable>
+  <name>jminos</name>
+  <developer_name>Zulianc</developer_name>
+  <summary>Amazing stacker game by the J </summary>
+  <metadata_license>CC0-1.0</metadata_license>
+  <project_license>GPL-3.0-only</project_license>
+  <url type="homepage">https://git.ale-pri.com/TetrisNerd/jminos</url>
+  <description>
+    <p>
+      Modern stacker game with every polyominoes from size 1 to 15, made in C++ with SFML 3!
+    </p>
+    <p>Features</p>
+    <ul>
+      <li>Every polyominoes up to pentedecaminoes!</li>
+      <li>7bag with proportionnality for each polyomino size!</li>
+      <li>AutoRS as the Rotation System!</li>
+      <li>0° rotations!</li>
+      <li>All spin!</li>
+      <li>IRS, IHS, infinite hold, and other leniency mechanics!</li>
+      <li>Customizable board size!</li>
+      <li>Customizable keybinds!</li>
+      <li>Very bland interface!! (i&#39;m not a designer)</li>
+    </ul>
+    <p>Available gamemodes</p>
+    <ul>
+      <li>SPRINT : clear 40 lines as fast as possible!</li>
+      <li>MARATHON : clear 200 lines with increasing gravity!</li>
+      <li>ULTRA : scores as much as possible in only 2 minutes!</li>
+      <li>MASTER : clear 200 lines at levels higher than maximum gravity!</li>
+      <li>INVISIBLE : get 1000 grade while not being able to see the board!</li>
+      <li>ZEN : practice indefinitely in this mode with no gravity!</li>
+    </ul>
+  </description>
+
+  <launchable type="desktop-id">
+    org.zulianc.jminos.desktop
+  </launchable>
+  <categories>
+    <category>Game</category>
+  </categories>
+  <screenshots>
+    <screenshot type="default">
+      <caption>Big piece</caption>
+      <image>https://git.ale-pri.com/TetrisNerd/jminos/raw/branch/main/doc/readme/big_piece.png</image>
+    </screenshot>
+    <screenshot>
+      <caption>Dark Settings</caption>
+      <image>https://git.ale-pri.com/TetrisNerd/jminos/media/branch/main/doc/readme/pieces_selection.png</image>
+    </screenshot>
+    <screenshot>
+      <caption>Light Interface</caption>
+      <image>https://git.ale-pri.com/TetrisNerd/jminos/media/branch/main/doc/readme/rotations.gif</image>
+    </screenshot>
+    <screenshot>
+      <caption>Light Grid View</caption>
+      <image>https://git.ale-pri.com/TetrisNerd/jminos/media/branch/main/doc/readme/rotation_0.gif</image>
+    </screenshot>
+  </screenshots>
+  <releases>
+    <release version="1.0" date="2025-07-02">
+      <url>https://git.ale-pri.com/TetrisNerd/jminos/src/tag/v1.0/</url>
+      <description>
+        Inital release
+      </description>
+    </release>
+  </releases>
+  <content_rating type="oars-1.1" />
+</component>