Add downloads badges to README.md #25

Job	Run time
e2e-tests (ubuntu-latest, 3.10) / e2e-tests	11m 49s
e2e-tests (ubuntu-latest, 3.8) / e2e-tests	11m 48s
e2e-tests (ubuntu-latest, 3.7) / e2e-tests	12m 41s
e2e-tests (ubuntu-latest, 3.9) / e2e-tests	13m 34s
e2e-tests (windows-latest, 3.10) / e2e-tests	25m 44s
e2e-tests (windows-latest, 3.7) / e2e-tests	20m 51s
e2e-tests (windows-latest, 3.8) / e2e-tests	29m 6s
e2e-tests (windows-latest, 3.9) / e2e-tests	28m 15s
lint (ubuntu-latest, 3.10) / lint	4m 14s
unit-tests (ubuntu-latest, 3.10) / unit-tests	17m 31s
unit-tests (ubuntu-latest, 3.7) / unit-tests	12m 59s
unit-tests (ubuntu-latest, 3.8) / unit-tests	17m 54s
unit-tests (ubuntu-latest, 3.9) / unit-tests	14m 7s
unit-tests (windows-latest, 3.10) / unit-tests	25m 30s
unit-tests (windows-latest, 3.7) / unit-tests	22m 37s
unit-tests (windows-latest, 3.8) / unit-tests	22m 13s
unit-tests (windows-latest, 3.9) / unit-tests	25m 35s
	5h 16m 28s

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