fix(prometheus-bind-exporter): init

.gitmodules

@@ -104,3 +104,6 @@
 [submodule "oracle-instantclient-jdbc"]
 	path = oracle-instantclient-jdbc
 	url = https://aur.archlinux.org/oracle-instantclient-jdbc.git
+[submodule "prometheus-bind-exporter"]
+	path = prometheus-bind-exporter
+	url = ssh://aur@aur.archlinux.org/prometheus-bind-exporter.git