Update README.md

README.md

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 # "Probabilistic Machine Learning: Advanced Topics" by Kevin Murphy.
 
-For details, see <a href="https://probml.github.io/pml-book/book2.html">here</a>.
+
+This repo is used to store the pdf for 
+<a href="https://probml.github.io/pml-book/book2.html">book 2</a>
+(see "downloadable assets" on RHS), and to keep track of downloads and issues,
+in a way which can be trakced separately than for 
+<a href="https://probml.github.io/pml-book/book1.html">book 1</a>. 
+