The open source OpenXR runtime

doc: Add general tracing

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doc/tracing.md
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··· 1 + # Tracing support {#tracing} 2 + 3 + <!-- 4 + Copyright 2022, Collabora, Ltd. and the Monado contributors 5 + SPDX-License-Identifier: BSL-1.0 6 + --> 7 + 8 + Monado has two tracing backends, one based on Perfetto and the other based on 9 + Tracy. See either sub pages for documentation on each, @ref tracing-perfetto, 10 + @ref tracing-tracy. There is also metrics collection in Monado, you can find 11 + more documentation on the @ref metrics page.