Document how to fetch the domains

README.markdown

@@ -22,10 +22,14 @@ This library is a Ruby client you can use to interact with the [DNSimple API v2]
 ```ruby
 require 'dnsimple'
 
+client = Dnsimple::Client.new(access_token: "a1b2c3")
 
 # Fetch your user details
 
 # List your domains
+client.domains.list(1234)                       # => domains from the account 1234, first page
+client.domains.list(1234, query: { page: 3 })   # => domains from the account 1234, third page
+client.domains.all(1234)                        # => all domains from the account 1234 (use carefully)
 
 # Create a domain