Merge pull request #187 from mspnp/mike/readme

Readme for n-tier windows RA

virtual-machines/n-tier-windows/readme.md

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+# N-tier application with SQL Server
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+This reference architecture shows how to deploy VMs and a virtual network configured for an N-tier application, using SQL Server on Windows for the data tier.
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+![](https://docs.microsoft.com/azure/architecture/reference-architectures/n-tier/images/n-tier-sql-server.png)
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+For deployment instructions and guidance about best practices, see the article [N-tier application with SQL Server](https://docs.microsoft.com/azure/architecture/reference-architectures/n-tier/n-tier-sql-server) on the Azure Architecture Center.
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+The deployment uses [Azure Building Blocks](https://github.com/mspnp/template-building-blocks/wiki) (azbb), a command line tool that simplifies deployment of Azure resources.