Added backend

gswi.SMTP.Interface/ISMTPClient.cs

@@ -0,0 +1,10 @@
+using System.Threading.Tasks;
+using gswi.SMTP.Model;
+
+namespace gswi.SMTP.Interface
+{
+    public interface ISMTPClient
+    {
+        Task SendEmailAsync(EMail email);
+    }
+}

gswi.SMTP.Interface/gswi.SMTP.Interface.csproj

@@ -0,0 +1,11 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <ItemGroup>
+    <ProjectReference Include="..\gswi.SMTP.Model\gswi.SMTP.Model.csproj" />
+  </ItemGroup>
+
+  <PropertyGroup>
+    <TargetFramework>net6.0</TargetFramework>
+  </PropertyGroup>
+
+</Project>