Add XML docs to core packages

src/Microsoft.AspNetCore.NodeServices/Util/EmbeddedResourceReader.cs

@@ -4,8 +4,17 @@ using System.Reflection;
 
 namespace Microsoft.AspNetCore.NodeServices
 {
+    /// <summary>
+    /// Contains methods for reading embedded resources.
+    /// </summary>
     public static class EmbeddedResourceReader
     {
+        /// <summary>
+        /// Reads the specified embedded resource from a given assembly.
+        /// </summary>
+        /// <param name="assemblyContainingType">Any <see cref="Type"/> in the assembly whose resource is to be read.</param>
+        /// <param name="path">The path of the resource to be read.</param>
+        /// <returns>The contents of the resource.</returns>
         public static string Read(Type assemblyContainingType, string path)
         {
             var asm = assemblyContainingType.GetTypeInfo().Assembly;