增加配置文件，增加数据库codefirst

liaoxujun@qq.com

2023-07-26 4f0567c2e02d1bbdfe497dad9b948d3ecf4d3c3a

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<Project Sdk="Microsoft.NET.Sdk">
 
  <PropertyGroup>
    <TargetFramework>net6.0</TargetFramework>
    <ImplicitUsings>enable</ImplicitUsings>
    <Nullable>enable</Nullable>
  </PropertyGroup>
 
</Project>