Added a couple examples.

examples/invoices.rb

@@ -0,0 +1,36 @@
+require 'bravo'
+require 'pp'
+
+# Set up Bravo defaults/config.
+Bravo.pkey              = 'spec/fixtures/certs/pkey'
+Bravo.cert              = 'spec/fixtures/certs/cert.crt'
+Bravo.cuit              = '20287740027'
+Bravo.sale_point        = '0002'
+Bravo.default_concepto  = 'Productos y Servicios'
+Bravo.default_moneda    = :peso
+Bravo.own_iva_cond      = :responsable_inscripto
+Bravo.openssl_bin       = '/usr/local/Cellar/openssl/1.0.1e/bin/openssl'
+Bravo::AuthData.environment         = :test
+
+# Let's issue a Factura for 1200 ARS to a Responsable Inscripto
+bill_a = Bravo::Bill.new(iva_condition: :responsable_inscripto, net: 1200, invoice_type: :invoice)
+bill_a.document_number      = '30710151543' 
+bill_a.document_type        = 'CUIT'
+bill_a.authorize
+
+puts "Let's issue a Factura for 1200 ARS to a Responsable Inscripto"
+puts "Authorization result = #{ bill_a.authorized? }"
+puts "Authorization response."
+pp bill_a.response
+
+# Let's issue a Factura for 100 ARS to a Consumidor Final
+bill_b = Bravo::Bill.new(iva_condition: :consumidor_final, net: 100, invoice_type: :invoice)
+bill_b.document_number = '28774003'
+bill_b.document_type = 'DNI'
+bill_b.authorize
+
+puts "Let's issue a Factura for 100 ARS to a Consumidor Final"
+puts "Authorization result = #{ bill_b.authorized? }"
+puts "Authorization response."
+pp bill_b.response
+