Add XML docs to core packages

src/Microsoft.AspNetCore.NodeServices/Configuration/NodeHostingModel.cs

@@ -1,8 +1,18 @@
 namespace Microsoft.AspNetCore.NodeServices
 {
+    /// <summary>
+    /// Represents a way of creating and invoking code in a Node.js environment.
+    /// </summary>
     public enum NodeHostingModel
     {
+        /// <summary>
+        /// An out-of-process Node.js instance where RPC calls are made via HTTP.
+        /// </summary>
         Http,
+
+        /// <summary>
+        /// An out-of-process Node.js instance where RPC calls are made over binary sockets.
+        /// </summary>
         Socket,
     }
 }