XR_KHR_vulkan_enable2 Tutorial

For a OpenXR app on Linux with Vulkan, would it be good to have a tutorial based on the newer XR_KHR_vulkan_enable2?

Some systems like this headset emulator only implement XR_KHR_vulkan_enable2 and the current tutorial doesn't cover using it: https://github.com/chnoblouch/aethervr#openxr-runtime

Review the current Linux tutorial and its Vulkan setup, then compare its initialization path with the XR_KHR_vulkan_enable2 requirements described in the issue. Add a tutorial covering that extension and verify it works with a runtime that implements only XR_KHR_vulkan_enable2, such as the linked headset emulator.

Written by the indexing model from the issue text.