NGSTACK-805: add documentation #41

Job	Run time
8.1 unit	29s
8.1 integration legacy	50s
8.1 integration solr 7.7.3 single	1m 21s
8.1 integration solr 7.7.3 dedicated	2m 54s
8.1 integration solr 7.7.3 shared	1m 19s
8.1 integration solr 7.7.3 cloud	3m 18s
8.1 integration solr 7.7.3 regression single	15m 21s
8.1 integration solr 7.7.3 regression dedicated	14m 55s
8.1 integration solr 7.7.3 regression shared	19m 27s
8.1 integration solr 7.7.3 regression cloud	16m 8s
8.1 integration solr 8.11.2 single	1m 36s
8.1 integration solr 8.11.2 dedicated	3m 29s
8.1 integration solr 8.11.2 shared	3m 33s
8.1 integration solr 8.11.2 cloud	2m 37s
8.1 integration solr 8.11.2 regression single	12m 55s
8.1 integration solr 8.11.2 regression dedicated	13m 56s
8.1 integration solr 8.11.2 regression shared	17m 29s
8.1 integration solr 8.11.2 regression cloud	15m 44s
	2h 27m 21s

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