update README.md

Author: gmao-cda

README.md

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 # Data assimilation Project: Experiments with the Lorenz-63 Model
 **Online community**: [![Discord](https://img.shields.io/discord/1129502879477141528?logo=Discord)](https://discord.gg/FdFFUy9Zcc)
 
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 Author: Da,Cheng     Email: cda@umd.edu