Update README.md

README.md

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 ## Tutorial and documentation
 
-For compiling and running egos-riscv, you can watch our video Tutorial ([Youtube](), [Bilibili]()) or read `Usages.md` in this repository. 
+For compiling and running egos-riscv, you can watch our video Tutorial ([Youtube](), [Bilibili]()) or read [Usages.md](Usages.md). 
 The [documentation repository]() further introduces the teaching plans, architecture and development history of egos-riscv.
 
 For any questions, please contact [Yunhao Zhang](https://dolobyte.net/) or [Robbert van Renesse](https://www.cs.cornell.edu/home/rvr/).