fixed bug with etc. Added to readme (#18)

HomebrewFormula/coredns.rb

@@ -58,6 +58,7 @@ class Coredns < Formula
     end
 
     (buildpath/"Corefile.example").write default_coredns_config
+    (etc/"coredns").mkpath
     etc.install "Corefile.example" => "coredns/Corefile"
   end
 

README.md

@@ -3,6 +3,20 @@ Scripts, utilities, and examples for deploying CoreDNS.
 
 
 ## MacOS
- To install:
-  - `brew tap "coredns/deployment" "https://github.com/coredns/deployment"`
-  - `brew install coredns`
+The default settings will proxy all requests to hostnames not found in your host file to Google's DNS-over-HTTPS.
+
+To install:
+  - Run `brew tap "coredns/deployment" "https://github.com/coredns/deployment"`
+  - Run `brew install coredns`
+  - Run `sudo brew services start coredns`
+  - test with `dig google.com @127.0.0.1` and you should see  `SERVER: 127.0.0.1#53(127.0.0.1)`
+
+Using CoreDNS as your default resolver:
+ - Open Network Preferences
+ - Select your interface i.e Wi-Fi
+ - Click `Advanced`
+ - Select the `DNS` tab
+ - Click the `+` below the `DNS Servers` list box
+ - Type `127.0.0.1` and hit enter
+ - Click `OK`
+ - Click `Apply`