add CORS to example app

Author: jaredcnance

JsonApiDotNetCoreExample/Startup.cs

@@ -32,7 +32,8 @@ public Startup(IHostingEnvironment env)
         public void ConfigureServices(IServiceCollection services)
         {
             // Add framework services.
-            services.AddMvc();
+            services.AddCors();
+
             services.AddDbContext<ApplicationDbContext>(options =>
               options.UseNpgsql(Configuration["Data:ConnectionString"]),
               ServiceLifetime.Transient);
@@ -54,6 +55,9 @@ public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerF
             loggerFactory.AddConsole(Configuration.GetSection("Logging"));
             loggerFactory.AddDebug();
 
+            app.UseCors(builder =>
+                      builder.WithOrigins("http://localhost:4200").AllowAnyHeader().AllowAnyMethod().AllowCredentials());
+
             app.UseJsonApi();
         }
     }