README.Android: document how to get pretty-printers work
README.Android: document how to get pretty-printers work

Change-Id: I0e421aaa38934f6fb2dd8992261ebcde80896e12

JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core