Add Metainfo

[danirabbit]

Fixes #232

[ryonakano]

Also, the pot and po files look like old. I got the following diff when I update pot with ninja command:

user@VirtualBox-b7276fc5:~/work/dock$ git diff
diff --git a/po/extra/extra.pot b/po/extra/extra.pot
index 5d4f581..a9301e2 100644
--- a/po/extra/extra.pot
+++ b/po/extra/extra.pot
@@ -8,7 +8,7 @@ msgid ""
 msgstr ""
 "Project-Id-Version: extra\n"
 "Report-Msgid-Bugs-To: \n"
-"POT-Creation-Date: 2024-05-10 09:35-0700\n"
+"POT-Creation-Date: 2024-05-10 23:43+0000\n"
 "PO-Revision-Date: YEAR-MO-DA HO:MI+ZONE\n"
 "Last-Translator: FULL NAME <EMAIL@ADDRESS>\n"
 "Language-Team: LANGUAGE <LL@li.org>\n"
@@ -30,5 +30,5 @@ msgid "elementary, Inc."
 msgstr ""

 #: data/dock.metainfo.xml.in:28
-msgid "First Release 🎉️"
+msgid "Complete rewrite 🎉️"
 msgstr ""
user@VirtualBox-b7276fc5:~/work/dock$

[danirabbit]

@ryonakano fixed! Thanks for the attention to detail :)