Update README.md

README.md

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 # YACL-R (Yet Another Cryptographic Library for Research)
 
+```
+██╗   ██╗ █████╗  ██████╗██╗           ██████╗ 
+╚██╗ ██╔╝██╔══██╗██╔════╝██║           ██╔══██╗
+ ╚████╔╝ ███████║██║     ██║     █████╗██████╔╝
+  ╚██╔╝  ██╔══██║██║     ██║     ╚════╝██╔══██╗
+   ██║   ██║  ██║╚██████╗███████╗      ██║  ██║
+   ╚═╝   ╚═╝  ╚═╝ ╚═════╝╚══════╝      ╚═╝  ╚═╝
+```                                       
+
 Yacl-r is a fork and extension of the C++ crypto library [secretflow/yacl](https://github.com/secretflow/yacl). The crypto modules in Yacl implement many state-of-art secure computation protocols, including primitives like OT, VOLE, TPRE, and tools like PRG, RO. Check the full list of Yacl's supported algorithms in [ALGORITHMS.md](ALGORITHMS.md).
 
 > [!WARNING]