Add docs about citing GATK #4545

Job	Run time
check if the environment has privileges	1s
Validate script WDLs using womtools	1m 0s
Validate generated WDLs using womtools	13m 33s
build and push gatk docker to artifacts	17m 12s
WDL test RUN_CNV_GERMLINE_COHORT_WDL on cromwell	24m 10s
WDL test RUN_CNV_GERMLINE_CASE_WDL on cromwell	25m 13s
WDL test RUN_CNV_SOMATIC_WDL on cromwell	24m 15s
WDL test RUN_M2_WDL on cromwell	16m 38s
WDL test RUN_VCF_SITE_LEVEL_FILTERING_WDL on cromwell	13m 25s
Java 17.0.6+10 build and test cloud	15m 54s
Java 17.0.6+10 build and test integration	33m 57s
Java 17.0.6+10 build and test unit	20m 53s
Java 17.0.6+10 test on docker integration	36m 44s
Java 17.0.6+10 test on docker unit	22m 32s
Java 17.0.6+10 test on docker variantcalling	31m 56s
Java 17.0.6+10 test on docker conda	24m 28s
	5h 21m 51s

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