Add project files.

src/modules/Elsa.Email/Extensions/ModuleExtensions.cs

@@ -0,0 +1,20 @@
+using Elsa.Email.Features;
+using Elsa.Features.Services;
+
+// ReSharper disable once CheckNamespace
+namespace Elsa.Extensions;
+
+/// <summary>
+/// Provides methods to install and configure email related features.
+/// </summary>
+public static class ModuleExtensions
+{
+    /// <summary>
+    /// Adds the <see cref="EmailFeature"/> feature to the system.
+    /// </summary>
+    public static IModule UseEmail(this IModule configuration, Action<EmailFeature>? configure = default)
+    {
+        configuration.Configure(configure);
+        return configuration;
+    }
+}