Add ExchangeName and ExchangeType config.

src/DotNetCore.CAP.RabbitMQ/CAP.RabbiMQOptions.cs

@@ -25,9 +25,17 @@
         /// <remarks> PLEASE KEEP THIS MATCHING THE DOC ABOVE.</remarks>
         public const string DefaultVHost = "/";
 
+        /// <summary>
+        /// Default exchange name (value: "cap").
+        /// </summary>
+        public const string DefaultExchangeName = "cap";
+
         /// <summary>The host to connect to.</summary>
         public string HostName { get; set; } = "localhost";
 
+        /// <summary> The topic exchange type. </summary>
+        internal string EXCHANGE_TYPE = "topic";
+
         /// <summary>
         /// Password to use when authenticating to the server.
         /// </summary>
@@ -43,6 +51,11 @@
         /// </summary>
         public string VirtualHost { get; set; } = DefaultVHost;
 
+        /// <summary>
+        /// Topic exchange name when declare a topic exchange.
+        /// </summary>
+        public string TopicExchangeName { get; set; } = DefaultExchangeName;
+
         /// <summary>
         /// Timeout setting for connection attempts (in milliseconds).
         /// </summary>