Added endpoint for registering a user locally after successful logon from Auth0

YABA.Common/Attributes/ClaimNameAttribute.cs

@@ -0,0 +1,14 @@
+using System;
+
+namespace YABA.Common.Attributes
+{
+    public class ClaimNameAttribute : Attribute
+    {
+        public string Name { get; private set; }
+
+        public ClaimNameAttribute(string name)
+        {
+            this.Name = name;
+        }
+    }
+}