Create dotnet-core-3.0-preview2.md

dotnet-core-3.0-preview2.md

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+# .NET Core 3.0 Preview 2
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+To create or open applications targeting .NET Core 3.0 Preview 2, Visual Studio 2019 16.0-preview2 or newer is required. Click the following link to download the latest version of Visual Studio 2019. If you are after an offline installation follow these instructions on [how to install offline](https://docs.microsoft.com/visualstudio/install/create-an-offline-installation-of-visual-studio).
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+* [Download Visual Studio 2019](https://visualstudio.microsoft.com/vs/preview/)