Closes #169: added AppStream manifest file

I have no idea if it actually works, but hey, it's a try

flatpak/com.sumnerevans.SublimeMusic.json

@@ -6,6 +6,7 @@
   "command": "sublime-music",
   "rename-icon": "sublime-music",
   "rename-desktop-file": "sublime-music.desktop",
+  "rename-appdata-file": "sublime-music.metainfo.xml",
   "add-extentions": {
     "org.freedesktop.Platform.ffmpeg-full": {
       "directory": "lib/ffmpeg",
@@ -20,26 +21,14 @@
     "--share=network",
     "--socket=pulseaudio",
     "--socket=session-bus",
+    "--own-name=org.mpris.MediaPlayer2.SublimeMusic",
     "--filesystem=xdg-config/sublime-music",
     "--filesystem=xdg-cache/sublime-music",
     "--filesystem=xdg-data/sublime-music"
   ],
   "modules": [
     {
-      "name": "desktop",
-      "buildsystem": "simple",
-      "build-commands": [
-        "install -Dm644 sublime-music.desktop /app/share/applications/sublime-music.desktop"
-      ],
-      "sources": [
-        {
-          "type": "file",
-          "path": "../sublime-music.desktop"
-        }
-      ]
-    },
-    {
-      "name": "icons",
+      "name": "icons-and-metadata",
       "buildsystem": "simple",
       "build-commands": [
         "install -Dm644 16.png /app/share/icons/hicolor/16x16/apps/sublime-music.png",
@@ -52,12 +41,22 @@
         "install -Dm644 96.png /app/share/icons/hicolor/96x96/apps/sublime-music.png",
         "install -Dm644 128.png /app/share/icons/hicolor/128x128/apps/sublime-music.png",
         "install -Dm644 192.png /app/share/icons/hicolor/192x192/apps/sublime-music.png",
-        "install -Dm644 512.png /app/share/icons/hicolor/512x512/apps/sublime-music.png"
+        "install -Dm644 512.png /app/share/icons/hicolor/512x512/apps/sublime-music.png",
+        "install -Dm644 sublime-music.desktop /app/share/applications/sublime-music.desktop",
+        "install -Dm644 sublime-music.metainfo.xml /app/share/metainfo/sublime-music.metainfo.xml"
       ],
       "sources": [
         {
           "type": "dir",
           "path": "../logo/rendered"
+        },
+        {
+          "type": "file",
+          "path": "../sublime-music.desktop"
+        },
+        {
+          "type": "file",
+          "path": "../sublime-music.metainfo.xml"
         }
       ]
     },

sublime-music.metainfo.xml

@@ -0,0 +1,83 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!-- Copyright 2020 Sumner Evans -->
+<component type="desktop-application">
+    <id>com.sumnerevans.SublimeMusic</id>
+    <metadata_license>FSFAP</metadata_license>
+    <project_license>GPL-3.0+</project_license>
+    <name>Sublime Music</name>
+    <summary>Native Subsonic client for Linux</summary>
+
+    <description>
+        <p>
+            Sublime Music is a GTK3
+            Subsonic/Airsonic/Revel/Gonic/Navidrome/*sonic client for the Linux
+            Desktop.
+        </p>
+        <p>Features:</p>
+        <ul>
+            <li>Switch between multiple Subsonic-API-compliant servers.</li>
+            <li>Play music through Chromecast devices on the same LAN.</li>
+            <li>
+                DBus MPRIS interface integration for controlling Sublime Music
+                via DBus MPRIS clients such as playerctl, i3status-rust, KDE
+                Connect, and many commonly used desktop environments.
+            </li>
+            <li>
+                Browse songs by the sever-reported filesystem structure, or
+                view them organized by ID3 tags in the Albums, Artists, and
+                Playlists views.
+            </li>
+            <li>Intuitive play queue.</li>
+            <li>Create/delete/edit playlists.</li>
+            <li>Cache songs for offline listening.</li>
+        </ul>
+    </description>
+
+    <launchable type="desktop-id">sublime-music.desktop</launchable>
+
+    <screenshots>
+        <screenshot type="default">
+            <caption>Album cover tab</caption>
+            <image>https://sumner.gitlab.io/sublime-music/_images/albums.png</image>
+        </screenshot>
+        <screenshot type="default">
+            <caption>Artists uab</caption>
+            <image>https://sumner.gitlab.io/sublime-music/_images/artists.png</image>
+        </screenshot>
+        <screenshot type="default">
+            <caption>Browse uab</caption>
+            <image>https://sumner.gitlab.io/sublime-music/_images/browse.png</image>
+        </screenshot>
+        <screenshot type="default">
+            <caption>Playlists tab</caption>
+            <image>https://sumner.gitlab.io/sublime-music/_images/playlists.png</image>
+        </screenshot>
+        <screenshot type="default">
+            <caption>Play queue</caption>
+            <image>https://sumner.gitlab.io/sublime-music/_images/play-queue.png</image>
+        </screenshot>
+        <screenshot type="default">
+            <caption>Play on other devices</caption>
+            <image>https://sumner.gitlab.io/sublime-music/_images/chromecasts.png</image>
+        </screenshot>
+        <screenshot type="default">
+            <caption>Search for artists, albums, songs, and playlists</caption>
+            <image>https://sumner.gitlab.io/sublime-music/_images/search.png</image>
+        </screenshot>
+    </screenshots>
+
+    <url type="homepage">https://sublimemusic.app</url>
+    <url type="bugtracker">https://gitlab.com/sumner/sublime-music/issues</url>
+
+    <provides>
+        <id>sublime-music.desktop</id>
+    </provides>
+
+    <content_rating type="oars-1.0" />
+    <update_contact>me_AT_sumnerevans.com</update_contact>
+
+    <releases>
+        <release version="0.9.2" date="2020-05-07">
+        </release>
+    </releases>
+</component>