Add some explanations about the new scripts

bin/wait-for-connection

@@ -1,4 +1,9 @@
 #!/usr/bin/php
+#
+# This script tries to connect to a database for a given interval
+# Useful in case of installation e.g. to wait for the database to not generate unnecessary errors
+#
+# Usage: php bin/wait-for-connection {HOST} {PORT} [{TIMEOUT}]
 
 <?php
 $timeout = 60;