add link to detailed module description to Math's README
add link to detailed module description to Math's README

Change-Id: I930f8729a58fb8cd3209df2ad1b112150796f50f

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