Added support guide. #5

Job	Run time
buildbot / check-if-allowed	1s
buildbot / msan	5m 3s
buildbot / print	1m 0s
buildbot / asan (njs)	3m 53s
buildbot / test (alpine-3.19, amd64)	5m 54s
buildbot / asan (quickjs)	5m 20s
buildbot / test (alpine-3.19, arm64)	3m 57s
buildbot / test (amazonlinux-2, amd64)	3m 32s
buildbot / test (amazonlinux-2, arm64)	2m 38s
buildbot / test (amazonlinux-2023, amd64)	7m 59s
buildbot / test (amazonlinux-2023, arm64)	5m 56s
buildbot / test (debian-11, amd64)	3m 52s
buildbot / test (debian-11, arm64)	2m 56s
buildbot / test (debian-12, amd64)	5m 12s
buildbot / test (debian-12, arm64)	3m 34s
buildbot / test (freebsd-14, amd64)	4m 5s
buildbot / test (rhel-7, amd64)	2m 23s
buildbot / test (rhel-8, amd64)	4m 22s
buildbot / test (rhel-8, arm64)	2m 44s
buildbot / test (rhel-9, amd64)	7m 55s
buildbot / test (rhel-9, arm64)	5m 53s
buildbot / test (sles-12, amd64)	2m 17s
buildbot / test (ubuntu-20.04, amd64)	1m 36s
buildbot / test (ubuntu-20.04, arm64)	3m 9s
buildbot / test (ubuntu-22.04, amd64)	7m 29s
buildbot / test (ubuntu-22.04, arm64)	5m 47s
buildbot / test (ubuntu-23.10, amd64)	8m 7s
buildbot / test (ubuntu-23.10, arm64)	6m 0s
buildbot / test (debian-12, x86)	5m 25s
	2h 7m 59s

Provide feedback