(DOCSP-7894): added ruby x509 snippet (#585)

* (DOCSP-7894): added ruby x509 snippet

* updated url

* updated rb example snippet

Author: Mohammad Hunan Chughtai

source/includes/connection-snippets/x509-snippets/ruby-connection.rb

@@ -0,0 +1,11 @@
+# begin x509 connection
+require 'mongo'
+certificate_key_file_path = '/etc/certs/mongodb/client.pem'
+uri = 'mongodb+srv://<cluster-url>/test?authSource=$external&tlsCertificateKeyFile=' + certificate_key_file_path + '&retryWrites=true&w=majority&authMechanism=MONGODB-X509'
+
+client = Mongo::Client.new([ uri ], :database => 'testDB')
+
+collection = client[:testCol]
+doc_count = collection.count_documents({})
+print doc_count
+# end x509 connection