Update README.md

Author: xiaomingfu2013

README.md

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 # DelaySSAToolkit
 
-| **Documentation** | **Build Status** |
-|:-----------------:|:----------------:|
-| [![doc dev badge]][doc dev link] | [![ci badge]][ci link] [![cov badge]][cov link] |
+| **Documentation** | **Build Status** | **Downloads** |
+|:-----------------:|:----------------:|:----------------:|
+| [![doc dev badge]][doc dev link] | [![ci badge]][ci link] [![cov badge]][cov link] | [![download badge]][download link]|
 
 [doc dev badge]: https://img.shields.io/badge/docs-dev-blue.svg
 [doc dev link]: https://palmtree2013.github.io/DelaySSAToolkit.jl/dev/
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 [cov badge]: https://codecov.io/gh/palmtree2013/DelaySSAToolkit.jl/branch/main/graph/badge.svg
 [cov link]: https://codecov.io/gh/palmtree2013/DelaySSAToolkit.jl
 
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+[download badge]: https://shields.io/endpoint?url=https://pkgs.genieframework.com/api/v1/badge/DelaySSAToolkit
+[download link]: https://pkgs.genieframework.com?packages=DelaySSAToolkit
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 <!-- [![Coverage](https://codecov.io/gh/palmtree2013/DelaySSAToolkit.jl/branch/main/graph/badge.svg)](https://codecov.io/gh/palmtree2013/DelaySSAToolkit.jl) -->
 
 DelaySSAToolkit.jl is a tool developed on top of [JumpProcesses.jl](https://github.com/SciML/JumpProcesses.jl) in Julia which solves the stochastic simulation [[1]](#1) coupled with delays. A portion of this library’s code is taken from the MIT licensed JumpProcesses.jl library.