chore: import upstream snapshot with attribution

dotnet/samples/Demos/ModelContextProtocolClientServer/MCPServer/Resources/TextDataModel.cs

@@ -0,0 +1,29 @@
+// Copyright (c) Microsoft. All rights reserved.
+
+using Microsoft.Extensions.VectorData;
+
+namespace MCPServer.Resources;
+
+/// <summary>
+/// A simple data model for a record in the vector store.
+/// </summary>
+public class TextDataModel
+{
+    /// <summary>
+    /// Unique identifier for the record.
+    /// </summary>
+    [VectorStoreKey]
+    public required Guid Key { get; init; }
+
+    /// <summary>
+    /// The text content of the record.
+    /// </summary>
+    [VectorStoreData]
+    public required string Text { get; init; }
+
+    /// <summary>
+    /// The embedding for the record.
+    /// </summary>
+    [VectorStoreVector(1536)]
+    public required ReadOnlyMemory<float> Embedding { get; init; }
+}