createFont(wb, color=NULL, fontHeightInPoints=NULL, fontName=NULL,
isItalic=FALSE, isStrikeout=FALSE, isBold=FALSE, underline=NULL,
boldweight=NULL)createWorkbook or loadWorkbook.colors can be
used.createFont returns a java reference to a Font object.NULL parameters are taken from Excel. So
the default font color is black, the default font name is "Calibri", and
the font height in points is 11. NOTE: You need to have a Workbook object to attach a
Font object to it.
CellStyle for using the a Font object.