Update README to remove WIP and clarify blueprint status #362

Job	Run time
Slow tests: typescript with pnpm	51s
Slow tests: typescript with npm	1m 28s
Slow tests: defaults with npm	1m 17s
Lint	15s
Slow tests: defaults with pnpm	46s
Tests (rollup-build)	16s
Slow tests: try-scenarios	1m 59s
Tests (monorepo with npm)	20s
Tests (monorepo with pnpm)	16s
Tests (addon-location)	14s
Tests (test-app-location)	15s
Tests (declarations-configuration)	27s
Tests (addon-only)	20s
	8m 44s

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