Update README.md

Author: Harikrishna Menon

README.md

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 The home of the NuGet.server package, a lightweight standalone NuGet server
 
+# Open Source Code of Conduct
+This project has adopted the [Microsoft Open Source Code of Conduct](https://opensource.microsoft.com/codeofconduct/). For more information see the [Code of Conduct FAQ](https://opensource.microsoft.com/codeofconduct/faq/) or contact [[email protected]](mailto:[email protected]) with any additional questions or comments.
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 ## Feedback
 
 If you're having trouble with the NuGet.org Website or NuGet.Server, file a bug on the [NuGet Gallery Issue Tracker](https://github.com/nuget/NuGetGallery/issues).