feat: add workflows/README.md to elaborate on GitHub workflows (#210) #755

Job	Run time
test-fake-database	23s
test-server	2m 3s
framework (random, no-auth)	14m 8s
framework (controlled, no-auth)	20m 28s
core (random, all-features)	27m 17s
core (random, single-seller)	27m 39s
core (random, no-payment-reconciliation)	30m 44s
core (random, no-auth)	29m 55s
core (random, no-tax-calculation)	25m 29s
core (random, prepayment-always-required)	28m 15s
core (random, facilityuse-has-slots)	26m 15s
core (controlled, all-features)	23m 53s
core (controlled, single-seller)	26m 25s
core (controlled, no-payment-reconciliation)	27m 40s
core (controlled, no-auth)	27m 24s
core (controlled, no-tax-calculation)	27m 14s
core (controlled, prepayment-always-required)	23m 47s
core (controlled, facilityuse-has-slots)	23m 33s
deploy-reference-implementation	56s
publish-fake-database	0s
publish-server	0s
	6h 53m 28s

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