Replace example in README to using primitives #2445

Job	Run time
lint (3.10)	1m 34s
sdist (3.8, ubuntu-latest, x64)	3m 3s
sdist (3.9, ubuntu-latest, x64)	3m 3s
sdist (3.10, ubuntu-latest, x64)	3m 5s
sdist (3.11, ubuntu-latest, x64)	2m 49s
sdist (3.12.0, ubuntu-latest, x64)	3m 8s
tests-json-input (3.10, ubuntu-latest)	7m 22s
Windows Python 3.8	8m 35s
macOS Python 3.8	1m 49s
Linux Python 3.8	6m 46s
macOS Python 3.9	1s
Windows Python 3.9	8m 34s
Linux Python 3.9	8m 3s
Windows Python 3.10	7m 37s
macOS Python 3.10	8m 42s
Linux Python 3.10	7m 32s
Windows Python 3.11	7m 21s
macOS Python 3.11	7m 7s
Linux Python 3.11	7m 3s
Windows Python 3.12.0	8m 11s
macOS Python 3.12.0	1m 48s
Linux Python 3.12.0	7m 36s
Linux Python 3.10 ('qiskit>=1.0.0rc1')	6m 47s
	2h 7m 36s

Provide feedback