Add the country conversion process to the handbook

@brittanyr kindly review, please feel free to edit and or suggest another location for this. I felt it is suitable to put this under our contracts page, but their might be another good home for this, that I did not think about! When you have completed your review or edit's, kindly assign to Paul for merging.

@cteskey @jhurewitz @pmachle feel free to suggest any changes.