message: Add section on deprecated elements to README.md.
diff: @@ -556,6 +556,28 @@ By defining ```VULKAN_HPP_NO_SMART_HANDLE``` before including vulkan.hpp, the he
  32-bit vulkan is not typesafe for handles, so we don't allow copy constructors on this platform by default. To enable this feature on 32-bit platforms define ```VULKAN_HPP_TYPESAFE_CONVERSION```.
  +## Deprecated elements
  +
  +There are a couple of elements in vulkan.hpp that are marked as deprecated (with C++14 and above):
  +
  +The implicit cast operators on ```vk::ResultValue``` are potentially wrong under certain circumstances. You should access the value explicitly as the member of the ```vk::ResultValue``` instead
  +
  +The type traits ```cpp_type<ObjectType::eObjectTypeID>``` are replaced by the more general type traits ```CppType<Type, Type::eTypeID>```.
  +
  +Some functions (listed below) provide an interface that does not fit to the general approach in vulkan.hpp, where values you get from a function are supposed to be returned. Use the corresponding functions with the same name, that actually return those values, instead.
  +The affected functions are
  +```
  + Device::getAccelerationStructureHandleNV
  + Device::getCalibratedTimestampsEXT
  + Device::getQueryPoolResults
  + Device::getRayTracingCaptureReplayShaderGroupHandlesKHR
  + Device::getRayTracingShaderGroupHandlesKHR
  + Device::getRayTracingShaderGroupHandlesNV
  + Device::writeAccelerationStructuresPropertiesKHR
  + PhysicalDevice::enumerateQueueFamilyPerformanceQueryCountersKHR
  +```
  +All those elements will be removed around November 2021.
  +
  ## See Also
  Feel free to submit a PR to add to this list.
  