docs: Add shields to README #634

Job	Run time
Lint check / Lint check (3.10)	12s
Lint check / Lint check (3.13)	11s
Lint check / Lint check (3.12)	10s
Type check / Type check (3.10)	24s
Type check / Type check (3.13)	28s
Lint check / Lint check (3.11)	9s
Docs check / Docs check	1m 11s
Type check / Type check (3.12)	28s
Type check / Type check (3.11)	23s
Unit tests / Unit tests (ubuntu-latest, 3.12)	29s
Unit tests / Unit tests (ubuntu-latest, 3.13)	26s
Unit tests / Unit tests (ubuntu-latest, 3.10)	27s
Unit tests / Unit tests (ubuntu-latest, 3.11)	22s
Unit tests / Unit tests (windows-latest, 3.10)	43s
Unit tests / Unit tests (windows-latest, 3.11)	53s
Unit tests / Unit tests (windows-latest, 3.13)	46s
Unit tests / Unit tests (windows-latest, 3.12)	45s
Integration tests / Approve integration tests for PRs from forks	6m 20s
Integration tests / Integration tests (3.13)	6m 20s
Integration tests / Integration tests (3.10)	6m 20s
	27m 27s

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