add README #155

Job	Run time
check / clang-checks	1m 26s
check / doxygen	50s
check / editor-config	10s
check / include-orders	4s
check / cppcheck / cppcheck-test	11s
build-os-matrix	1s
build (oraclelinux:9) / build	1m 12s
build (oraclelinux:8) / build	1m 19s
build (rockylinux:9) / build	56s
build (fedora:38) / build	1m 35s
make-test (fedora:38) / make-test	1m 48s
make-test (oraclelinux:9) / make-test	1m 32s
make-test (oraclelinux:8) / make-test	1m 36s
make-test (rockylinux:9) / make-test	1m 22s
rpm-test (fedora:38) / test	45s
rpm-test (oraclelinux:8) / test	38s
rpm-test (oraclelinux:9) / test	21s
rpm-test (rockylinux:9) / test	15s
	16m 1s

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