Added some doc on how to run YAML tests manually
Added some doc on how to run YAML tests manually

Thanks to an explanation on the mailing list by James Teh

IndexBraille/liblouis,liblouis/liblouis,hammera/liblouis,vsmontalvao/liblouis,liblouis/liblouis,vsmontalvao/liblouis,hammera/liblouis,IndexBraille/liblouis,BueVest/liblouis,vsmontalvao/liblouis,hammera/liblouis,liblouis/liblouis,hammera/liblouis,liblouis/liblouis,hammera/liblouis,liblouis/liblouis,liblouis/liblouis,vsmontalvao/liblouis,BueVest/liblouis,IndexBraille/liblouis,hammera/liblouis,IndexBraille/liblouis,BueVest/liblouis,BueVest/liblouis,vsmontalvao/liblouis,IndexBraille/liblouis,BueVest/liblouis,BueVest/liblouis