Use build tasks and nuspec to build Episerver addon in visual studio ( https://devblog.gosso.se/?p=1148 )

buildtasks.targets

<?xml version="1.0" encoding="utf-8"?>
<Project xmlns="http://schemas.microsoft.com/developer/msbuild/2003" ToolsVersion="4.0">

  <UsingTask TaskName="ZipDirectory" TaskFactory="CodeTaskFactory" AssemblyFile="$(MSBuildToolsPath)\Microsoft.Build.Tasks.v4.0.dll">
    <ParameterGroup>
      <InputPath ParameterType="System.String" Required="true" />
      <OutputFileName ParameterType="System.String" Required="true" />
      <OverwriteExistingFile ParameterType="System.Boolean" Required="false" />
    </ParameterGroup>
    <Task>
      <Reference Include=" System.IO.Compression.FileSystem" />
      <Using Namespace="System.IO" />
      <Using Namespace="System.IO.Compression" />
      <Code Type="Fragment" Language="cs">
        <![CDATA[        
          if(this.OverwriteExistingFile) {
            File.Delete(this.OutputFileName);
          }
          ZipFile.CreateFromDirectory(this.InputPath, this.OutputFileName);
        ]]>
      </Code>
    </Task>
  </UsingTask>

  <UsingTask TaskName="GetVersion"
         TaskFactory="CodeTaskFactory"
         AssemblyFile="$(MSBuildToolsPath)\Microsoft.Build.Tasks.v4.0.dll">

    <ParameterGroup>
      <AssemblyPath ParameterType="System.String" Required="true" />
      <Version ParameterType="System.String" Output="true" />
    </ParameterGroup>

    <Task>
      <Using Namespace="System" />
      <Using Namespace="System.Diagnostics" />
      <Code Type="Fragment" Language="cs">
        <![CDATA[
              Log.LogMessage("Getting version details of assembly at: " + this.AssemblyPath, MessageImportance.High);
              this.Version = FileVersionInfo.GetVersionInfo(this.AssemblyPath).FileVersion;
              ]]>
      </Code>
    </Task>
  </UsingTask>

  <PropertyGroup>
    <SolutionDir Condition="$(SolutionDir) == ''">$(MSBuildProjectDirectory)\..\</SolutionDir>
    <NuGetExe>$(SolutionDir)FotoWare.PlugIns.Episerver\.nuget\NuGet.exe</NuGetExe>
    <TmpOutDir>$(SolutionDir)FotoWare.PlugIns.Episerver\tmp</TmpOutDir>
    <NuspecFile>$(SolutionDir)FotoWare.PlugIns.Episerver\FotoWare.PlugIns.Episerver.nuspec</NuspecFile>
  </PropertyGroup>

  <Target Name="CreateNugetPackage" AfterTargets="Build">
    <PropertyGroup>
      <Version></Version>
    </PropertyGroup>

    <GetVersion AssemblyPath="$(SolutionDir)FotoWare.PlugIns.Episerver\bin\$(Configuration)\FotoWare.PlugIns.Episerver.dll">
      <Output TaskParameter="Version" PropertyName="Version" />
    </GetVersion>

    <!-- Update the module config with the version information -->
    <XmlPoke XmlInputPath="$(SolutionDir)Alloytemplates\modules\_protected\FotoWare.PlugIns.Episerver\module.config" Query="/module/@clientResourceRelativePath" Value="$(Version)" />


    <!-- Create the Versioned out dir for the client resources $(Version)-->
    <MakeDir Directories="$(TmpOutDir)\content\modules\_protected\" />

    <!-- Copy -->
    <ItemGroup>
      <ClientResources Include="$(SolutionDir)Alloytemplates\modules\_protected\FotoWare.PlugIns.Episerver\**\*" />
    </ItemGroup>

    <Copy SourceFiles="$(SolutionDir)FotoWare.PlugIns.Episerver\MSBuild\web.config.install.xdt" DestinationFolder="$(TmpOutDir)\content" />
    <Copy SourceFiles="$(SolutionDir)FotoWare.PlugIns.Episerver\MSBuild\web.config.uninstall.xdt" DestinationFolder="$(TmpOutDir)\content" />
    <!--<Copy SourceFiles="$(SolutionDir)\module.config" DestinationFolder="$(TmpOutDir)\content" />-->
    <Copy SourceFiles="@(ClientResources)" DestinationFiles="@(ClientResources -> '$(TmpOutDir)\content\modules\_protected\FotoWare.PlugIns.Episerver\%(RecursiveDir)%(Filename)%(Extension)')"/>

 
     <!--Create the Zip file--> 
    <ZipDirectory
      InputPath="$(SolutionDir)Alloytemplates\modules\_protected\FotoWare.PlugIns.Episerver\"
      OutputFileName="$(TmpOutDir)\content\modules\_protected\FotoWare.PlugIns.Episerver\FotoWare.PlugIns.Episerver.zip"
      OverwriteExistingFile="true" />

    <RemoveDir Directories="$(TmpOutDir)\content\modules\_protected\FotoWare.PlugIns.Episerver\$(Version)" />

    <!-- Create the package -->
    <PropertyGroup>
      <NugetCommand>
        "$(NuGetExe)" pack "$(NuspecFile)" -OutputDirectory "$(OutDir.TrimEnd('\\'))" -Version "$(Version)" -Properties Configuration=$(Configuration)
      </NugetCommand>
    </PropertyGroup>
    <Exec Command="$(NugetCommand)"/>

    <!-- Cleanup -->
    <RemoveDir Directories="$(TmpOutDir)" />

  </Target>

</Project>

FotoWare.PlugIns.Episerver.nuspec

<?xml version="1.0"?>
<package xmlns="http://schemas.microsoft.com/packaging/2010/07/nuspec.xsd">
  <metadata>
    <id>FotoWare.PlugIns.Episerver</id>
    <version>$version$</version>
    <title>Episerver Addon integrates Fotoware DAM with Episerver CMS and Commerce</title>
    <authors>FotoWare</authors>
    <owners>FotoWare</owners>
    <iconUrl>https://www.fotoware.com/hubfs/FotoWare_January2018/image/favicon.ico</iconUrl>
    <projectUrl>https://learn.fotoware.com/02_FotoWeb_8.0/Integrating_FotoWeb_with_third-party_systems/Episerver_plugin_documentation</projectUrl>
    <requireLicenseAcceptance>false</requireLicenseAcceptance>
    <description>This Episerver Addon integrates Fotoware DAM with Episerver CMS and Commerce</description>
    <releaseNotes>More information check FotoWare website </releaseNotes>
    <copyright>MIT</copyright>
    <tags>EPiServerModulePackage EPiServer-UI EPiServerAddOn ThirdPartyAddon FotoWare FotoWare Imagebank Mediabank Integration CMS11 Epinova TinyMCE</tags>
    <dependencies>
      <dependency id="EPiServer.CMS.UI" version="[11.15,12.0)" />
      <dependency id="EPiServer.CMS.TinyMce" version="[2.0,3.0)" />
      <dependency id="System.Json" version="[4.5,6.0)" />
    </dependencies>
  </metadata>
  <files>
    <file src="bin\$configuration$\FotoWare.PlugIns.Episerver.dll" target="lib\net45\" />
    <file src="tmp\content\**\*" target="content" />
    <file src="..\AlloyTemplates\Views\Shared\DisplayTemplates\FotoWareImageUrl.cshtml" target="content\views\shared\displaytemplates\" />
    <file src="..\AlloyTemplates\Views\Shared\DisplayTemplates\FotoWareImage.cshtml" target="content\views\shared\displaytemplates\" />
    <file src="msbuild\readme.txt" target="" />
    <file src="..\AlloyTemplates\fotoware\*" target="tools\extras" />
    <file src="..\FotoWare.PlugIns.Episerver.ArchiveImport\fotowareImport*" target="tools\extras" />
  </files>
</package>