Add project files.

PoweredSoft.Module.Abstractions/IModule.cs

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+using Microsoft.Extensions.DependencyInjection;
+using System;
+
+namespace PoweredSoft.Module.Abstractions
+{
+    public interface IModule
+    {
+        IServiceCollection ConfigureServices(IServiceCollection services);
+    }
+}

PoweredSoft.Module.Abstractions/PoweredSoft.Module.Abstractions.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>netstandard2.0</TargetFramework>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.Extensions.DependencyInjection.Abstractions" Version="2.0.0" />
+  </ItemGroup>
+
+</Project>

PoweredSoft.Module.Abstractions/ServiceCollectionExtensions.cs

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+using Microsoft.Extensions.DependencyInjection;
+
+namespace PoweredSoft.Module.Abstractions
+{
+    public static class ServiceCollectionExtensions
+    {
+        public static IServiceCollection AddModule<T>(IServiceCollection services)
+            where T : IModule, new()
+        {
+            var module = new T();
+            return module.ConfigureServices(services);
+        }
+    }
+}