Update README.md

README.md

 # Network Automation Minilab
 
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+|![Warning](./images/warning_icon.png)| **DISCLAIMER <p> This setup has been tested on Linux and OSX it may not work on Windows. |
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 Vagrantfile and additional configuration to deploy a development environment like the one shown in the picture:
 
 ![Dev_Environment_Topology](./images/DevEnvironment.png)