docs(quickstart): update docs for quick start

[BinWang28]

• add search example

Checklist for PR

• Write a descriptive PR title following the Angular commit message format: <type>(<scope>): <subject>

  • Examples: feat(agent): add pdf tool via mcp, perf: make llm client async, fix(utils): load custom config via importlib
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    • Update README ❌ Missing type and colon
    • feat add new feature ❌ Missing colon after type
    • Feature: add new tool ❌ Invalid type (should be feat)
    • feat(Agent): add tool ❌ Scope should be lowercase
    • feat(): add tool ❌ Empty scope not allowed
    • feat(my_scope): add tool ❌ Underscores not allowed in scope
    • feat(my space): add tool ❌ Space not allowed in scope
    • feat(scope):add tool ❌ Missing space after colon
    • feat(scope): ❌ Empty subject

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