Update README.md

Author: niemyjski

README.md

@@ -11,6 +11,8 @@ Refer to the Exceptionless documentation here: [Exceptionless Docs](http://docs.
 
 All of our [.NET clients can be installed](https://www.nuget.org/profiles/exceptionless?showAllPackages=True) via the [NuGet package manager](https://docs.nuget.org/consume/Package-Manager-Dialog). If you need help, please contact us via in-app support or [open an issue](https://github.com/exceptionless/Exceptionless.Net/issues/new). We’re always here to help if you have any questions!
 
+**This section is for development purposes only! If you are trying to use the Exceptionless .NET libraries then please get them from NuGet.**
+
 1. You will need to have [Visual Studio 2013](http://www.visualstudio.com/products/visual-studio-community-vs) installed.
 2. Open the `Exceptionless.Net.sln` Visual Studio solution file.
 3. Select `Exceptionless.SampleConsole` as the startup project.