Update README.md

README.md

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 Overview
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-This repository implements some common path planning algorithms used in robotics, including Search-based algorithms and Sampling-based algorithms. We designed animation for each algorithm to display the running process.
+This repository implements some common path planning algorithms used in robotics, including Search-based algorithms and Sampling-based algorithms. We designed animation for each algorithm to display the running process. The related papers are listed in [Papers](https://github.com/zhm-real/PathPlanning#papers).
 
 Directory Structure
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@@ -32,6 +32,7 @@ Directory Structure
         ├── Spline-RRT*
         ├── Fast Marching Trees (FMT*)
         └── Batch Informed Trees (BIT*)
+    └── Papers
 
 ## Animations - Search-Based
 ### Best-First & Dijkstra