Updated readme with project web site

Author: stiber

README.md

@@ -4,6 +4,9 @@ Signal-Computing
 Digital signal processing textbook for computer science
 majors.
 
+You can find the main web site for this project at
+http://faculty.washington.edu/stiber/pubs/Signal-Computing/.
+
 This work is licensed under a
 [Creative Commons Attribution-ShareAlike 4.0 International License.](creativecommons.org/licenses/by-sa/4.0/)