Web.debug.config if you already have Umbraco set up

Web.debug.config

<?xml version="1.0" encoding="utf-8"?>

<!-- For more information on using web.config transformation visit http://go.microsoft.com/fwlink/?LinkId=125889 -->

<configuration xmlns:xdt="http://schemas.microsoft.com/XML-Document-Transform">
  <!--
    Set your connection string in the XML snippet below
  -->
  <connectionStrings>
    <add name="umbracoDbDSN"
      connectionString="" providerName="System.Data.SqlClient"
        xdt:Transform="SetAttributes" xdt:Locator="Match(name)"/>
  </connectionStrings>
</configuration>