build: add README.md to package

Author: ttu

JsonFlatFileDataStore/JsonFlatFileDataStore.csproj

@@ -15,6 +15,7 @@
  <FileVersion>2.4.1.0</FileVersion>
  <Product>JsonFlatFileDataStore</Product>
  <PackageLicenseFile>LICENSE</PackageLicenseFile>
+ <PackageReadmeFile>README.md</PackageReadmeFile>
  <LangVersion>8</LangVersion>
  <PackageVersion>2.4.1</PackageVersion>
  </PropertyGroup>
@@ -35,10 +36,8 @@
  </ItemGroup>
 
  <ItemGroup>
- <None Include="..\LICENSE">
- <Pack>True</Pack>
- <PackagePath></PackagePath>
- </None>
+ <None Include="..\README.md" Pack="true" PackagePath="\"/>
+ <None Include="..\LICENSE" Pack="true" PackagePath="\"/>
  </ItemGroup>
 
 </Project>