metainfo: move away from deprecated appdata

rpcs3/rpcs3.metainfo.xml

@@ -0,0 +1,37 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!-- Copyright 2018 RPCS3-->
+<component type="desktop-application">
+    <id>RPCS3</id>
+    <metadata_license>FSFAP</metadata_license>
+    <project_license>GPL-2.0-only</project_license>
+    <name>RPCS3</name>
+    <summary>Open-source Sony PlayStation 3 Emulator</summary>
+
+    <description>
+        <p>
+            RPCS3 is an experimental open-source Sony PlayStation 3 emulator and debugger written in C++ for Windows and Linux. RPCS3 started development in May of 2011 by its founders DH and Hykem.
+            The emulator is currently capable of running over 1800 commercial titles powered by Vulkan and OpenGL.
+        </p>
+        <p>
+            The goal of this project is to experiment, research, and educate on the topic of PlayStation 3 emulation that can be performed on compatible devices and operating systems.
+            All information was obtained legally by purchasing PlayStation 3 hardware and software. Additional information was obtained from various sources on the internet that include but is not limited to system hardware and software documentation.
+            Most of this information can be found on the PlayStation 3 Developer Wiki.
+        </p>
+    </description>
+
+    <launchable type="desktop-id">rpcs3.desktop</launchable>
+
+    <url type="homepage">https://rpcs3.net</url>
+    <url type="bugtracker">https://github.com/RPCS3/rpcs3/issues</url>
+    <url type="help">https://rpcs3.net/quickstart</url>
+
+    <screenshots>
+        <screenshot type="default">
+            <image>https://rpcs3.net/blog/wp-content/uploads/2017/05/progress/vklinux.jpg</image>
+        </screenshot>
+    </screenshots>
+
+    <provides>
+        <binary>rpcs3</binary>
+    </provides>
+</component>