add login service

OpenAuth.Infrastructure/Repository/UserRepository.cs

@@ -0,0 +1,25 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using OpenAuth.Domain.Interface;
+using OpenAuth.Domain.Model;
+
+namespace OpenAuth.Infrastructure.Repository
+{
+    public class UserRepository :BaseRepository, IUserRepository
+    {
+        public User FindBy(string username)
+        {
+            try
+            {
+                return _Context.Users.First(e => e.Account == username);
+            }
+            catch (Exception)
+            {
+                return null;
+            }
+        }
+    }
+
+}