feat : add login api method

Program.cs

@@ -1,3 +1,6 @@
+using fubon_api.Controllers;
+using FubonNeo.Sdk;
+
 var builder = WebApplication.CreateBuilder(args);
 
 // Add services to the container.
@@ -7,6 +10,8 @@ builder.Services.AddControllers();
 builder.Services.AddEndpointsApiExplorer();
 builder.Services.AddSwaggerGen();
 
+builder.Services.AddSingleton<FubonSDK>();
+
 var app = builder.Build();
 
 // Configure the HTTP request pipeline.