Include example on adding to existing page about origami

[sudhanshu16]

Hey @JasonBarnabe, I know it has been a long time since you wrote this but it will be great if you can help.
I am trying to do the same and in the output the fields are showing up mirrored for some reason 🤔
Do you know the fix for this?
An example for the same:

cc @gdelugre

Code sample:

pdf = Origami::PDF.read file.path

page_count = pdf.pages.size

page_count.times do |i|
  page = pdf.get_page i + 1
  page.add_font Origami::Font::Type1::Standard::Helvetica.new.pre_build, :Helvetica
  contents = Origami::ContentStream.new
  contents.write("#nice text{i}", {
    x: x,
    y: y,
    font: :Helvetica
  })
  page.setContents([page.Contents, contents])
end

buffer = StringIO.new
pdf.write buffer
buffer.rewind

send_data buffer.string