data: Add test.xlsx
data: Add test.xlsx

The content was taken from test.xls. It will be used for examples of the XLSX
import API.

fstahnke/arx,jgaupp/arx,fstahnke/arx,kentoa/arx,kbabioch/arx,tijanat/arx,TheRealRasu/arx,jgaupp/arx,RaffaelBild/arx,arx-deidentifier/arx,bitraten/arx,COWYARD/arx,COWYARD/arx,RaffaelBild/arx,kbabioch/arx,tijanat/arx,kentoa/arx,bitraten/arx,arx-deidentifier/arx,TheRealRasu/arx