adding prop

OpenAI.SDK/ObjectModels/RequestModels/ChatCompletionCreateRequest.cs

@@ -308,4 +308,12 @@ public IEnumerable<ValidationResult> Validate()
     /// </summary>
     [JsonPropertyName("service_tier")]
     public string? ServiceTier { get; set; }
-}
+
+
+    /// <summary>
+    /// Whether or not to store the output of this chat completion request for use in our model distillation or evals products.
+    /// https://platform.openai.com/docs/api-reference/chat/create?lang=python#chat-create-store
+    /// </summary>
+    [JsonPropertyName("store")]
+    public bool? Store { get; set; } = false;
+}