proxy authentication added

CryptoExchange.Net/Objects/ApiProxy.cs

@@ -13,6 +13,16 @@ namespace CryptoExchange.Net.Objects
         /// </summary>
         public int Port { get; }
 
+        /// <summary>
+        /// The login of the proxy
+        /// </summary>
+        public string Login { get; }
+
+        /// <summary>
+        /// The password of the proxy
+        /// </summary>
+        public string Password { get; }
+
         /// <summary>
         /// Create new settings for a proxy
         /// </summary>
@@ -26,5 +36,22 @@ namespace CryptoExchange.Net.Objects
             Host = host;
             Port = port;
         }
+
+        /// <inheritdoc />
+        /// <summary>
+        /// Create new settings for a proxy
+        /// </summary>
+        /// <param name="host">The proxy hostname/ip</param>
+        /// <param name="port">The proxy port</param>
+        /// <param name="login">The proxy login</param>
+        /// <param name="password">The proxy password</param>
+        public ApiProxy(string host, int port, string login, string password) : this(host, port)
+        {
+            if (string.IsNullOrEmpty(login) || string.IsNullOrEmpty(password))
+                throw new ArgumentException("Proxy login or password not filled");
+
+            Login = login;
+            Password = Password;
+        }
     }
 }