add proof of concept sftp downloader

app/services/sftp/downloader.rb

@@ -0,0 +1,26 @@
+require 'net/sftp'
+require 'uri'
+require 'csv'
+
+module Sftp
+  class Downloader
+    def initialize
+      sftptogo_url = ENV['SFTPTOGO_URL']
+      uri = URI.parse(sftptogo_url)
+      Net::SFTP.start(uri.host, uri.user, password: uri.password) do |sftp|
+        # download a file or directory from the remote host
+        # open and read from a pseudo-IO for a remote file
+        # sftp.file.open('/mciea/data/canary.csv', 'r') do |f|
+        #   CSV.parse(f.read) do |row|
+        #     puts row
+        #   end
+        # end
+
+        # list the entries in a directory
+        sftp.dir.foreach('/mciea/data/') do |entry|
+          puts entry.longname
+        end
+      end
+    end
+  end
+end