added README

README.md

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+# Cool dns 
+
+A simple dns server written in Go. It supports zonefile parsing, different zones based on IP and forwarding. 
+
+# Configuration
+
+Example config file
+```yaml
+zones:                      
+- zone: example.com.        # Fully qualified domain name of the zone
+  file: zonefile.txt        # Path to the zonefile to parse
+
+- zone: example.com.
+  file: zonefile2.txt
+  acl:                      # What IPs can query the zone
+    - lan
+
+acl:                        # List of ip filter rules
+- name: vpn                 # Name of the rule
+  cidr: 10.0.0.0/24         # CIDR of the rule
+- name: lan
+  cidr: 192.168.0.0/16
+- name: local
+  cidr: 127.0.0.1/32
+
+forward:
+  acl:                      # What IPs are allowed
+    - vpn
+  server: "8.8.8.8:53"      # DNS server to forward to
+
+address: 0.0.0.0:8053       # What address and port to listen on
+```