Created backend

backend/SinkyShipsAPI/Program.cs

@@ -0,0 +1,41 @@
+using SinkyShipsAPI.Hubs;
+
+var builder = WebApplication.CreateBuilder(args);
+builder.Services.AddControllers();
+builder.Services.AddEndpointsApiExplorer();
+builder.Services.AddSignalR();
+builder.Services.AddSwaggerGen();
+builder.Services.AddCors();
+
+var app = builder.Build();
+// Configure the HTTP request pipeline.
+if (app.Environment.IsDevelopment())
+{
+    app.UseSwagger();
+    app.UseSwaggerUI();
+    app.UseCors(policyBuilder => policyBuilder
+        .AllowAnyHeader()
+        .AllowAnyMethod()
+        .AllowAnyOrigin()
+        .AllowCredentials()
+    );
+}
+app.UseHttpsRedirection();
+app.UseRouting();
+app.UseAuthorization();
+app.UseEndpoints(endpoints =>
+{
+    endpoints.MapHub<GameHub>("/hub"); 
+});
+
+app.MapGet("/", () => "Hello World!");
+
+//Websocket functions
+
+//SessionStart name -> sessionId
+//SessionJoin sessionCode, name -> sessionId
+//StartGame sessionId, settings
+//SubmitBoard shipPositions[] -> 
+//
+
+app.Run();