gui-apps/showmethekey: add myself as a maintainer

Signed-off-by: Ceres <ceres@ceressees.dev>

gui-apps/showmethekey/metadata.xml

@@ -1,7 +1,10 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!DOCTYPE pkgmetadata SYSTEM "https://www.gentoo.org/dtd/metadata.dtd">
 <pkgmetadata>
-	<!-- maintainer-needed -->
+	<maintainer type="person">
+		<email>ceres@ceressees.dev</email>
+		<name>Ceres Milner</name>
+	</maintainer>
 	<upstream>
 		<remote-id type="github">AlynxZhou/showmethekey</remote-id>
 	</upstream>