Introduce MAINTAINERS.md #3376

Job	Run time
codespell	16s
copyright_check	4s
examples_clang-format	6s
ubuntu-latest_g++_cxx14_relwithdebinfo_preview=OFF	18m 56s
macos-12_clang++_cxx14_relwithdebinfo_preview=ON	22m 21s
ubuntu-20.04_g++_cxx17_release_preview=ON	17m 9s
python_module_test_ubuntu_latest	31s
macos-13_clang++_cxx20_release_preview=ON-DBUILD_SHARED_LIBS=OFF	18m 28s
ubuntu-20.04_g++-10_cxx20_debug_preview=ON	13m 59s
ubuntu-22.04_g++-11_cxx20_release_preview=ON-DBUILD_SHARED_LIBS=OFF	18m 11s
examples_ubuntu-latest_g++_cxx14_relwithdebinfo_preview=OFF	3m 40s
examples_ubuntu-20.04_g++_cxx17_release_preview=ON	3m 50s
examples_ubuntu-20.04_g++-10_cxx20_debug_preview=ON	4m 37s
examples_macos-12_clang++_cxx14_relwithdebinfo_preview=ON	4m 4s
windows_cl2019_cxx14_relwithdebinfo_preview=ON	14m 14s
examples_windows_cl2019_cxx14_relwithdebinfo_preview=ON	6m 33s
windows_cl2019_cxx20_release_preview=ON-DBUILD_SHARED_LIBS=OFF	20m 37s
examples_windows_cl2022_cxx17_relwithdebinfo_preview=OFF	5m 38s
windows_cl2022_cxx17_relwithdebinfo_preview=OFF	15m 18s
documentation	52s
pages	0s
	3h 9m 24s

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