An msbuild package that packs your plugins when published. This uses a format created by the tModloader team to pack and publish mods for terraria.
Nuget package: https://www.nuget.org/packages/Obsidian.MSBuild
Install-Package Obsidian.MSBuild
If you're doing this manually and didn't use a template then you're going to create a new project. Install the package.
Open up your csproj and make sure you have this in either a new or exisiting PropertGroup.
<PropertyGroup>
<!-- this would usually be your publish directory. -->
<PublishDir>$(PublishUrl)</PublishDir>
<!-- this would be the Obsidian.API version -->
<PluginApiVersion>{{Obsidian.API VERSION}}</PluginApiVersion>
<PluginAssembly>{{YOUR PLUGIN ASSEMBLY}}</PluginAssembly>
<PluginVersion>{{YOUR PLUGIN VERSION}}</PluginVersion>
<!-- this is optional. used for signing plugins. must be in xmlformat and can be a file or just a direct value -->
<PluginSigningKey>{{YOUR SIGNING KEY}}</PluginSigningKey>
</PropertyGroup>After that just publish or (build on Release) your plugin and it will pack the plugin for you automatically and output that to the build and or publish directory.