Add a link to the DPR branch (microsoft#506)

Co-authored-by: Tianyu Li <[email protected]>

Author: tli2

Diff for: README.md

@@ -25,6 +25,8 @@ workloads. Start learning about FASTER, its unique capabilities, and how to get
 
 [aka.ms/FASTER](https://aka.ms/FASTER)
 
+For a preview of our new distributed recovery algorithm of DPR, please take a look at [the DPR development branch](https://github.com/microsoft/FASTER/tree/dpr)
+
 
 # Contributing