Add script for notifying Kosmos channels from Ruby

An example for notifying Kosmos XMPP channels from plain Ruby, with no
dependencies.

scripts/util/notify_xmpp.rb

@@ -0,0 +1,15 @@
+require 'uri'
+require 'net/http'
+require 'json'
+
+WEBHOOK_TOKEN = "foo"
+
+def send_notification(msg)
+  uri = URI.parse('https://hal8000.chat.kosmos.org/incoming/#{WEBHOOK_TOKEN}')
+  https = Net::HTTP.new(uri.host, uri.port)
+  https.use_ssl = true
+  request = Net::HTTP::Post.new(uri.request_uri, 'Content-Type' => 'application/json')
+  request.body = { room: "ops@kosmos.chat", message: msg }.to_json
+  response = https.request(request)
+  puts response.inspect
+end