Add initial project backend structure with Docker support and configuration files. Added some useful features such as async requests, automatically adding card by message from chat etc

Signed-off-by: Dmitrii <computer@yawaflua.tech>

Took 9 minutes

src/backend/SpMega.Backend/Program.cs

@@ -0,0 +1,39 @@
+namespace SpMega.Backend;
+
+public class Program
+{
+    public static void Main(string[] args)
+    {
+        var builder = WebApplication.CreateBuilder(args);
+
+        // Add services to the container.
+        builder.Services.AddAuthorization();
+
+
+        var app = builder.Build();
+
+        // Configure the HTTP request pipeline.
+
+        app.UseAuthorization();
+
+        var summaries = new[]
+        {
+            "Freezing", "Bracing", "Chilly", "Cool", "Mild", "Warm", "Balmy", "Hot", "Sweltering", "Scorching"
+        };
+
+        app.MapGet("/weatherforecast", (HttpContext httpContext) =>
+        {
+            var forecast = Enumerable.Range(1, 5).Select(index =>
+                    new WeatherForecast
+                    {
+                        Date = DateOnly.FromDateTime(DateTime.Now.AddDays(index)),
+                        TemperatureC = Random.Shared.Next(-20, 55),
+                        Summary = summaries[Random.Shared.Next(summaries.Length)]
+                    })
+                .ToArray();
+            return forecast;
+        });
+
+        app.Run();
+    }
+}