Convert the AppSettings to model class

Back/skydiveLogs-api.Model/CorsSettings.cs

@@ -0,0 +1,9 @@
+using System.Collections.Generic;
+
+namespace skydiveLogs_api.Model
+{
+    public class CorsSettings
+    {
+		public string FrontUrl { get; set; }
+    }
+}

Back/skydiveLogs-api.Model/JwtSettings.cs

@@ -0,0 +1,11 @@
+using System.Collections.Generic;
+
+namespace skydiveLogs_api.Model
+{
+    public class JwtSettings
+    {
+		public string Issuer { get; set; }
+
+		public string Passphrase { get; set; }
+    }
+}