[chore] Add AGENTS.md file #42565

Job	Run time
contrib-tests-prepare	6m 12s
contrib-tests-matrix (receiver-0)	10m 45s
contrib-tests-matrix (receiver-2)	10m 28s
contrib-tests-matrix (receiver-3)	8m 20s
contrib-tests-matrix (pkg)	7m 19s
contrib-tests-matrix (exporter-0)	3m 34s
contrib-tests-matrix (processor)	7m 57s
contrib-tests-matrix (other)	6m 6s
contrib-tests-matrix (cmd-0)	2m 58s
contrib-tests-matrix (extension)	10m 22s
contrib-tests-matrix (receiver-1)	10m 4s
contrib-tests-matrix (connector)	5m 17s
contrib-tests-matrix (exporter-1)	10m 38s
contrib-tests-matrix (internal)	13m 25s
contrib_tests	4s
	1h 53m 29s

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