Is there any way to add prebuild/postbuild options in dotnet core projects in Visual Studio ?
There is no option to add build events in project properties as it used to be with Standard dot net projects 

According the documentation, you can add commands, in scripts section, in project.json file.
"scripts": {
"precompile": [ "echo before" ],
"postcompile": [ "echo after" ]
}
Here is an example:
<Project... >
:
<Target Name="PreBuild" BeforeTargets="PreBuildEvent">
<Exec Command="echo before" />
</Target>
<Target Name="PostBuild" AfterTargets="PostBuildEvent">
<Exec Command="echo after" />
</Target>
:
</Project>
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