Add utf8 test file
Taken from https://github.com/pdf-association/pdf20examples/blob/master/pdf20-utf8-test.pdf
License: The PDF Association provides these example PDF 2.0 files under the Creative Commons Attribution-ShareAlike 4.0 International (CC BY-SA 4.0) license. Please see https://creativecommons.org/licenses/by-sa/4.0/ for further details.
Found in https://github.com/pdf-association/pdf20examples/commit/292f72f9655184d3e0f016568564f89f498a3529