Setup basic code for login.

API/Extensions/ApplicationServiceExtensions.cs

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+using API.Data;
+using API.Interfaces;
+using API.Services;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.Extensions.Configuration;
+using Microsoft.Extensions.DependencyInjection;
+
+namespace API.Extensions
+{
+    public static class ApplicationServiceExtensions
+    {
+        public static IServiceCollection AddApplicationServices(this IServiceCollection services, IConfiguration config)
+        {
+            services.AddScoped<ITokenService, TokenService>();
+            services.AddDbContext<DataContext>(options =>
+            {
+                options.UseSqlite(config.GetConnectionString("DefaultConnection"));
+            });
+
+            return services;
+        }
+    }
+}

API/Extensions/IdentityServiceExtensions.cs

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+using System.Collections;
+using System.Text;
+using Microsoft.AspNetCore.Authentication.JwtBearer;
+using Microsoft.Extensions.Configuration;
+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.IdentityModel.Tokens;
+
+namespace API.Extensions
+{
+    public static class IdentityServiceExtensions
+    {
+        public static IServiceCollection AddIdentityServices(this IServiceCollection services, IConfiguration config)
+        {
+            services.AddAuthentication(JwtBearerDefaults.AuthenticationScheme)
+                .AddJwtBearer(options =>
+                {
+                    options.TokenValidationParameters = new TokenValidationParameters()
+                    {
+                        ValidateIssuerSigningKey = true,
+                        IssuerSigningKey = new SymmetricSecurityKey(Encoding.UTF8.GetBytes(config["TokenKey"])),
+                        ValidateIssuer = false,
+                        ValidateAudience = false
+                    };
+                });
+            return services;
+        }
+    }
+}