added config.json (for ldap_auth)

config.json

+{
+	"ldap": {
+		"server": "ldap://frankiz.eleves.polytechnique.fr:636",
+		"searchBase": "ou=eleves,dc=frankiz,dc=net",
+		"searchFilter": "(uid={{username}})"
+	},
+	"sessionSecret":"change this"
+}