Add metainfo file

CMakeLists.txt

@@ -111,6 +111,9 @@ if(UNIX AND NOT APPLE)
             install(FILES space.nouspiro.tenmon.svg DESTINATION "/usr/share/icons/hicolor/scalable/apps")
         endif()
     endif()
+    if(DEFINED ENV{FLATPAK_DEST})
+        install(FILES space.nouspiro.tenmon.metainfo.xml DESTINATION "$ENV{FLATPAK_DEST}/share/metainfo")
+    endif()
 endif(UNIX AND NOT APPLE)
 
 option(RELEASE_BUILD "Release build" OFF)

space.nouspiro.tenmon.metainfo.xml

@@ -0,0 +1,44 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<component type="desktop">
+    <id>space.nouspiro.tenmon</id>
+    <launchable type="desktop-id">space.nouspiro.tenmon.desktop</launchable>
+    <name>Tenmon</name>
+    <summary>FITS/XISF image viewer, converter, index and search</summary>
+    <metadata_license>CC0-1.0</metadata_license>
+    <project_license>GPL-3.0</project_license>
+    <description>
+        <p>
+            It is intended primarily for viewing astro photos and images. It supports the following formats:
+            <ul>
+                <li>FITS 8, 16 bit integer and 32 bit float</li>
+                <li>XISF 8, 16 bit integer and 32 bit float</li>
+                <li>JPEG and PNG images</li>
+            </ul>
+        </p>
+            Features:
+            <ul>
+                <li>Using same stretch function as PixInsight</li>
+                <li>OpenGL accelerated drawing</li>
+                <li>Index and search FITS XISF header data</li>
+                <li>Quick mark images and then copy/move marked files</li>
+                <li>Convert FITS &lt;-&gt; XISF</li>
+                <li>Convert FITS/XISF -&gt; JPEG/PNG</li>
+                <li>Image statistics mean, media, min, max</li>
+                <li>Support for WCS</li>
+                <li>Thumbnails</li>
+            </ul>
+        <p>
+        </p>
+    </description>
+    <url type="homepage">https://nouspiro.space/?page_id=206</url>
+    <screenshots>
+        <screenshot type="default">
+            <image>https://nouspiro.space/wp-content/uploads/2022/04/tenmon-1024x579.png</image>
+        </screenshot>
+    </screenshots>
+    <content_rating type="oars-1.1"/>
+    <releases>
+        <release version="20221121" date="2022-11-11"/>
+        <release version="20221023" date="2022-10-23"/>
+    </releases>
+</component>