Added backend functionality

src/WorkTime.Api/Program.cs

@@ -1,15 +1,35 @@
+using Scalar.AspNetCore;
+using WorkTime.Api;
+using WorkTime.Api.Services;
+using WorkTime.Api.Services.Implementation;
+
 var builder = WebApplication.CreateBuilder(args);
 
 // Add services to the container.
 // Learn more about configuring OpenAPI at https://aka.ms/aspnet/openapi
 builder.Services.AddOpenApi();
+builder.AddServiceDefaults();
+builder.Services.AddControllers();
+
+builder.Services.AddProblemDetails();
+builder.Services.AddNpgsql<DatabaseContext>(builder.Configuration.GetConnectionString("data"));
+builder.Services.AddScoped<ITimeEntryService, TimeEntryService>();
 
 var app = builder.Build();
 
 // Configure the HTTP request pipeline.
 if (app.Environment.IsDevelopment()) {
     app.MapOpenApi();
+    app.MapScalarApiReference(options => {
+        options.Servers = [];
+    });
+
+    await app.Services
+        .CreateAsyncScope().ServiceProvider
+        .GetRequiredService<DatabaseContext>()
+        .Database.EnsureCreatedAsync();
 }
 
 app.UseHttpsRedirection();
+app.MapControllers();
 app.Run();