feat(application): add DocumentOperator.Application PDF signing contracts

DocumentOperator.Application/DependencyInjection.cs

@@ -0,0 +1,18 @@
+using Microsoft.Extensions.Configuration;
+using Microsoft.Extensions.DependencyInjection;
+
+namespace DocumentOperator.Application;
+
+public static class DependencyInjection
+{
+    public static IServiceCollection AddDocumentOperatorApplication(this IServiceCollection services, IConfiguration configuration)
+    {
+        services.AddMediatR(cfg =>
+        {
+            cfg.LicenseKey = configuration.GetValue<string>("LuckyPennySoftLicenseKey");
+            cfg.RegisterServicesFromAssembly(typeof(DependencyInjection).Assembly);
+        });
+
+        return services;
+    }
+}