Update README.md

Added required text from Daniela L.

README.md

@@ -8,6 +8,9 @@ BIGf90 is a wrapper package for BLUPf90 family of programs, please use the follo
 
 #### BLUPF90 Reference:
   Misztal, I., S. Tsuruta, D.A.L. Lourenco, I. Aguilar, A. Legarra, and Z. Vitezica. 2014. Manual for BLUPF90 family of programs: http://nce.ads.uga.edu/wiki/lib/exe/fetch.php?media=blupf90_all2.pdf")
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+*The BLUPF90 programs are free for research, but their use should be acknowledged in publications. For commercial use,
+please contact Ignacy Misztal (ignacy@uga.edu) or Daniela Lourenco (danilino@uga.edu). Provide your name, company, and purpose of use in the email.*   
 
 ### Overview
 This package has functions to: