Add README

README.md

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+ifconfig.co: Simple IP address lookup service
+=============================================
+
+A simple service for looking up your IP address. This is the code that powers
+http://ifconfig.co
+
+Basic usage
+===========
+    # The usual suspects
+    $ curl ifconfig.co
+    127.0.0.1
+    $ wget -O - ifconfig.co
+    127.0.0.1
+    # BSD fetch
+    $ fetch -o - ifconfig.co
+    127.0.0.1
+
+Pass the appropriate flag (usually -4 and -6) to your tool to switch between 
+IPv4 and IPv6 lookup.
+
+Features
+========
+* Easy to remember domain name
+* Supports IPv4 and IPv6
+* Open source
+* Fast
+* Supports typical CLI tools (curl, wget and fetch)
+
+Why?
+====
+* To scratch an itch
+* An excuse to use Go for something
+* Faster than ifconfig.me and has IPv6 support
+
+Code style
+==========
+    $ gofmt -tabs=false -tabwidth=4