Set PackageReadmeFile for display on nuget.org

Author: ckadluba

src/Serilog.Sinks.MSSqlServer/Serilog.Sinks.MSSqlServer.csproj

@@ -14,6 +14,7 @@
     <PackageId>Serilog.Sinks.MSSqlServer</PackageId>
     <PackageTags>serilog;sinks;mssqlserver</PackageTags>
     <PackageIcon>serilog-sink-nuget.png</PackageIcon>
+    <PackageReadmeFile>README.md</PackageReadmeFile>
     <PackageProjectUrl>https://github.com/serilog-mssql/serilog-sinks-mssqlserver</PackageProjectUrl>
     <PackageLicenseExpression>Apache-2.0</PackageLicenseExpression>
     <RepositoryUrl>https://github.com/serilog-mssql/serilog-sinks-mssqlserver</RepositoryUrl>
@@ -67,6 +68,7 @@
 
   <ItemGroup>
     <None Include="Images\serilog-sink-nuget.png" Pack="true" PackagePath="" />
+    <None Include="../../README.md" Pack="true" PackagePath="" />
   </ItemGroup>
 
   <ItemGroup>