Update README.md with link to RKDE paper

README.md

@@ -5,7 +5,7 @@
 
 PICATA is a tool for instructors who wish to combine Peer Instruction (PI) and
 Continuous Assessments (CA) utilizing results from students' earlier CA data.
-For more information on the PICA method, see the paper located at .... 
+For more information on the PICA method see this [paper](https://link.springer.com/chapter/10.1007/978-3-031-74627-7_1).   
 
 Currently, this terminal-based tool works with the Canvas Learning Management System (LMS) using the 
 [CanvasAPI](https://github.com/ucfopen/canvasapi). In addition to increased functionality, development