Add info on how to use a custom resolver

docs/custom-dns.md

@@ -0,0 +1,34 @@
+# How to resolve Domains to custom IPs by using dnsmasq on the host
+
+First edit /etc/hosts and add your overrides.
+
+Then run the following commands (Arch Linux) to install, enable and start dnsmasq
+
+```
+# pacman -S dnsmasq
+# systemctl enable dnsmasq
+# systemctl start dnsmasq
+```
+
+Uncomment or add the following config to your docker-compose.yml web service section (172.17.0.1 is the docker default network IP):
+
+```
+    dns:
+	  - 172.17.0.1
+```
+
+After changing /etc/hosts you can do
+
+```
+# systemctl restart dnsmasq
+```
+
+# How to use a different resolver
+
+Uncomment or add the following config to your docker-compose.yml web service section (172.17.0.1 is the docker default network IP):
+
+```
+    dns:
+	  - 1.1.1.1
+	  - 1.0.0.1
+```

docs/examples/docker-compose.yml

@@ -25,6 +25,10 @@ services:
     volumes:
       - ./files:/trashposs/files
       - ./.config:/trashposs/.config:ro
+# Uncomment this to use a DNS server on the host machine or specify a custom one
+# (172.17.0.1 is the IP of the default network bridge)
+#   dns:
+#     - 172.17.0.1
 
   redis:
     restart: unless-stopped