Add sealed results code example to readme

[erayaydin]

Replaces sealed results description with a usage example

[changeset-bot]

⚠️ No Changeset found

Latest commit: 62327a8

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[github-actions]

⚠️ This PR doesn't contain any changesets. If there are user-facing changes, don't forget to run:

pnpm exec changeset

to create a changeset.

[github-actions]

Coverage report

St.❔	Category	Percentage	Covered / Total
🟢	Statements	100%	183/183
🟢	Branches	100%	63/63
🟢	Functions	100%	35/35
🟢	Lines	100%	181/181

Test suite run success

74 tests passing in 9 suites.

Report generated by 🧪jest coverage report action from 62327a8

Show full coverage report

St	File	% Stmts	% Branch	% Funcs	% Lines	Uncovered Line #s
🟢	All files	100	100	100	100
🟢	src	100	100	100	100
🟢	index.ts	100	100	100	100
🟢	sealedResults.ts	100	100	100	100
🟢	serverApiClient.ts	100	100	100	100
🟢	types.ts	100	100	100	100
🟢	urlUtils.ts	100	100	100	100
🟢	webhook.ts	100	100	100	100
🟢	src/errors	100	100	100	100
🟢	apiErrors.ts	100	100	100	100
🟢	handleErrorResponse.ts	100	100	100	100
🟢	toError.ts	100	100	100	100
🟢	unsealError.ts	100	100	100	100