(chore) improve AATH readme with some dev instructions (#1273) #7733

Job	Run time
verify-code-formatting	22s
workflow-setup	19s
aries_vcx_clippy (credx,vdrtools_wallet)	2m 15s
workspace_clippy (vdrtools_wallet)	3m 43s
aries_vcx_clippy (vdr_proxy_ledger,vdrtools_wallet)	2m 16s
workspace_clippy (askar_wallet)	3m 34s
test-unit-workspace	1m 45s
workflow-setup-check	1s
build-docker-vdrproxy	9s
build-docker-aath-backchannel	8m 58s
test-compatibility-aries-vcx-wallet	52s
test-integration-aries-vcx (vdrtools_wallet,credx)	5m 56s
test-integration-aries-vcx-anoncreds-rs	3m 30s
test-integration-aries-vcx-mysql	2m 57s
test-integration-aries-vcx (askar_wallet,credx)	7m 11s
test-wallet-migrator	57s
test-integration-did-crate	1m 38s
test-integration-aries-vcx-vdrproxy	11m 1s
publish-docker-vdrproxy	7s
make-release	0s
publish-docker-aath-backchannel	0s
	57m 31s

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