Add run instructions in README.md.

README.md

@@ -3,3 +3,8 @@
 To generate the html tutorial, run `make`.
 
 The code generating the figure is in the directory `report/`. Use rstudio to open and run the Rmd file.
+
+To reproduce the figures run R in the project root directory and
+
+    library(rmarkdown)
+    render("report/abc-report.Rmd", knit_root_dir=getwd())