Added NLog, Added UserService, Added database and seed seed

Birdmap.BLL/Exceptions/AuthenticationException.cs

@@ -1,12 +1,26 @@
 using System;
+using System.Runtime.Serialization;
 
 namespace Birdmap.BLL.Exceptions
 {
+    [Serializable]
     public class AuthenticationException : Exception
     {
         public AuthenticationException()
             : base("Username or password is incorrect.")
         {
         }
+
+        public AuthenticationException(string message) : this()
+        {
+        }
+
+        public AuthenticationException(string message, Exception innerException) : this()
+        {
+        }
+
+        protected AuthenticationException(SerializationInfo info, StreamingContext context) : base(info, context)
+        {
+        }
     }
 }

Birdmap.BLL/Exceptions/EntityNotFoundException.cs

@@ -0,0 +1,25 @@
+using System;
+using System.Runtime.Serialization;
+
+namespace Birdmap.BLL.Exceptions
+{
+    [Serializable]
+    public class EntityNotFoundException : Exception
+    {
+        public EntityNotFoundException()
+        {
+        }
+
+        public EntityNotFoundException(string message) : base(message)
+        {
+        }
+
+        public EntityNotFoundException(string message, Exception innerException) : base(message, innerException)
+        {
+        }
+
+        protected EntityNotFoundException(SerializationInfo info, StreamingContext context) : base(info, context)
+        {
+        }
+    }
+}