adds R package installation instructions to README

README.md

@@ -26,6 +26,7 @@ build the template PDF, you need these dependencies:
 - GNU **make**
 - [graphviz][]
 - R including the packages **data.table**, **tidyverse** and **svglite**
+  `install.packages(c("data.table", "tidyverse", "svglite"), Ncpus = 8)`
 - [watchexec][]
 - [markdown-spellcheck][]