added first draft of profiler docs #471

Job	Run time
clippy	27s
coverage	3m 0s
Check	33s
Rustfmt	14s
Test Suite (ubuntu-20.04, stable)	2m 44s
Test Suite (self-hosted, linux, arm64, --cfg=aes_armv8, nightly-2023-06-27)	3m 46s
Test Suite (self-hosted, macos, arm64, --cfg=aes_armv8, nightly-2023-06-27)	1m 12s
Test Suite (macos-latest, stable)	3m 1s
Test Suite (windows-2019, stable)	6m 35s
Build library (ubuntu-20.04, libpost.so, libpost.a, linux, stable)	2m 8s
Build library (self-hosted, linux, arm64, libpost.so, libpost.a, --cfg=aes_armv8, linux-arm64, ni...	3m 22s
Build library (self-hosted, macos, arm64, libpost.dylib, libpost.a, --cfg=aes_armv8, macos-m1, ni...	58s
Build library (macos-latest, libpost.dylib, libpost.a, macos, stable)	1m 57s
Build library (windows-2019, post.dll, post.lib, windows, stable)	5m 31s
Publish release	0s
	35m 28s

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