Add rancher installation docs #211

Job	Run time
python 3.6 macos-11	3m 13s
python 3.11 macos-11	2m 56s
java 8 macos-11	2m 7s
python 3.6 windows-2019	5m 44s
python 3.11 windows-2019	4m 5s
java 8 windows-2019	3m 39s
python 3.6 ubuntu-20.04	1m 15s
python 3.11 ubuntu-20.04	1m 6s
java 8 ubuntu-20.04	1m 5s
windows_meterpreter windows-2019	3m 53s
windows_meterpreter windows-2022	4m 13s
mettle macos-11	2m 24s
mettle ubuntu-20.04	1m 22s
Generate report	37s
	37m 39s

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