Add appdata file

packaging/CMakeLists.txt

@@ -1,3 +1,7 @@
 configure_file(squawk.desktop squawk.desktop COPYONLY)
 
-install(FILES ${CMAKE_CURRENT_BINARY_DIR}/squawk.desktop DESTINATION ${CMAKE_INSTALL_DATADIR}/applications)
+install(FILES ${CMAKE_CURRENT_BINARY_DIR}/squawk.desktop DESTINATION ${CMAKE_INSTALL_DATADIR}/applications)
+
+configure_file(macaw.me.squawk.appdata.xml macaw.me.squawk.appdata.xml COPYONLY)
+
+install(FILES ${CMAKE_CURRENT_BINARY_DIR}/macaw.me.squawk.appdata.xml DESTINATION ${CMAKE_INSTALL_DATADIR}/metainfo)

packaging/macaw.me.squawk.appdata.xml

@@ -0,0 +1,33 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<component xmlns:xi="http://www.w3.org/2001/XInclude" xmlns:its="http://www.w3.org/2005/11/its" xmlns="https://specifications.freedesktop.org/metainfo/1.0" type="desktop-application">
+  <id>macaw.me.squawk</id>
+  <metadata_license>CC0-1.0</metadata_license>
+  <project_license>GPL-3.0+</project_license>
+  <name>Squawk</name>
+  <summary>Desktop Qt based XMPP messenger</summary>
+  <description>
+    <p>
+      Squawk is a lightweight XMPP desktop messenger.
+      The primary objective of this project is to offer
+      you a fast and user-friendly messaging experience
+      that closely aligns with your system’s style, while
+      also minimizing resource consumption.
+    </p>
+    <p>
+      Squawk is still at a very early stage and might not suit
+      everyone but you are welcome to try it out.
+    </p>
+  </description>
+  <launchable type="desktop-id">macaw.me.squawk.desktop</launchable>
+  <screenshots>
+    <screenshot type="default">
+      <image>https://macaw.me/projects/squawk/0.2.2.png</image>
+      <caption>View XMPP contacts and conversations</caption>
+    </screenshot>
+  </screenshots>
+  <url type="homepage">https://macaw.me/projects/squawk/</url>
+  <provides>
+    <binary>squawk</binary>
+  </provides>
+  <update_contact>blue@macaw.me</update_contact>
+</component>