Add acme to config file

examples/etc/turnserver.conf

@@ -719,6 +719,10 @@
 #
 #web-admin-listen-on-workers
 
+#acme-redirect=http://redirectserver/.well-known/acme-challenge/
+# Redirect ACME, i.e. HTTP GET requests matching '^/.well-known/acme-challenge/(.*)' to '<URL>$1'.
+# Default is '', i.e. no special handling for such requests.
+
 # Server relay. NON-STANDARD AND DANGEROUS OPTION.
 # Only for those applications when you want to run
 # server applications on the relay endpoints.