add csv data set example

.gitignore

@@ -21,3 +21,4 @@ tmp
 *.jtl
 *.bak
 .byebug_history
+.DS_Store

examples/csv_data_set.rb

@@ -0,0 +1,19 @@
+$LOAD_PATH.unshift(File.join(File.dirname(__FILE__), '..', 'lib'))
+require 'ruby-jmeter'
+
+test do
+  csv_data_set_config filename: 'postcodes.csv',
+    variableNames: 'postcode'
+
+  threads count: 1 do
+    visit name: 'Home', url: 'https://flooded.io?query=${postcode}'
+  end
+end.flood ENV['FLOOD_API_TOKEN'],
+  privacy: 'public',
+  name: ENV['FLOOD_NAME'] ||= 'Simple Demo',
+  project: 'workspace',
+  region: ENV['REGION'] ||= 'us-west-2',
+  override_parameters: '-Dsun.net.inetaddr.ttl=30',
+  files: [
+    "#{Dir.pwd}/postcodes.csv"
+  ]