sys-devel/gdb-dashboard: add metadata.xml

just noticed metadata was missing after pushing the commit.
pkgcheck didn't seem to complain...

Signed-off-by: NRK <nrk@disroot.org>

sys-devel/gdb-dashboard/metadata.xml

@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE pkgmetadata SYSTEM "https://www.gentoo.org/dtd/metadata.dtd">
+<pkgmetadata>
+	<maintainer type="person">
+		<email>nrk@disroot.org</email>
+	</maintainer>
+	<upstream>
+		<remote-id type="github">cyrus-and/gdb-dashboard</remote-id>
+	</upstream>
+</pkgmetadata>