Add configurations and update packages

GerstITS.Examples.Api/Common/Configurations/WebApiConfiguration.Server.CorsPolicy.cs

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+using GerstITS.System.Configurations;
+using GerstITS.Web.Api.Builder;
+using Microsoft.Extensions.Configuration;
+
+namespace BakeTronic.Web.Api.Configurations
+{
+    internal sealed class CorsPolicyConfiguration : ICorsPolicy, GerstITS.System.Configurations.IConfiguration
+    {
+        #region Constructors
+
+        public CorsPolicyConfiguration(string parentPrefix, Microsoft.Extensions.Configuration.IConfiguration configuration)
+        {
+            var prefix = $"{parentPrefix}:{this.ToConfigurationPrefix()}";
+
+            AllowCredentials = configuration.GetValue<bool>($"{prefix}:{nameof(AllowCredentials)}", false);
+            AllowedOrigins = configuration.GetSection($"{prefix}:{nameof(AllowedOrigins)}").Get<string[]>() ?? new string[0];
+            AllowedHeaders = configuration.GetSection($"{prefix}:{nameof(AllowedHeaders)}").Get<string[]>() ?? new string[0];
+            AllowedMethods = configuration.GetSection($"{prefix}:{nameof(AllowedMethods)}").Get<string[]>() ?? new string[0];
+        }
+
+        #endregion
+
+        #region ICorsPolicy
+
+        public bool AllowCredentials { get; }
+        public string[] AllowedOrigins { get; set; }
+        public string[] AllowedHeaders { get; set; }
+        public string[] AllowedMethods { get; set; }
+
+        #endregion
+    }
+}