added guidance for domainless setup, self-signed cert generation and DDNS setup.

setup/Dynamic DNS setup.txt

@@ -0,0 +1,15 @@
+If you have a dynamic public IP, you'll have to set up DDNS since a normal DNS only points to an ip statically, and if your ip changes, everything goes down until you update the DNS record.
+
+
+DDNS does this automatically. 
+
+select a reliable service:
+noip.com
+duckdns.org 
+dyn.com 
+dynv6.com 
+
+follow their install instructions. Generally, your router will have DDNS support. 
+
+If it does not, you can install a DDNS client on your server (apt install ddclient)
+