add xmldoc comments

web/backend/API/API.Core/Contracts/Common/ResponseBody.cs

@@ -1,12 +1,29 @@
 namespace API.Core.Contracts.Common;
 
+/// <summary>
+/// Generic envelope used to wrap API responses that carry a data payload alongside a human-readable message.
+/// </summary>
+/// <typeparam name="T">The type of the data payload returned in the response.</typeparam>
 public record ResponseBody<T>
 {
+    /// <summary>
+    /// A human-readable message describing the outcome of the request.
+    /// </summary>
     public required string Message { get; init; }
+
+    /// <summary>
+    /// The data payload associated with the response.
+    /// </summary>
     public required T Payload { get; init; }
 }
 
+/// <summary>
+/// Envelope used to wrap API responses that carry only a human-readable message and no data payload.
+/// </summary>
 public record ResponseBody
 {
+    /// <summary>
+    /// A human-readable message describing the outcome of the request.
+    /// </summary>
     public required string Message { get; init; }
 }