docs: add agentknowledge.md for AI assisted ACP agent setup and onboarding links

[LauJoeYing]

Summary

Adds agentknowledge.md so AI assistants (e.g. Cursor, Claude) can set up ACP agent code from natural-language prompts and point users to the right steps in the ACP Dev Onboarding Guide.

What's in the file

• Step-by-step user journey with direct links to each GitBook page (Set Up Agent Profile, Register Agent, Create Job Offering, Initialize & Whitelist Wallet, Customize Agent, Graduate Agent, Tips & Troubleshooting).
• ACP naming conventions for AI-generated code (e.g. snake_case for function/job names like hello_world).
• Repo/code patterns for implementing a seller (AcpClient, onNewTask, job.name/job.requirement, job.deliver()) and for exposing “query past requests” via getCompletedJobs/getActiveJobs/getJobById.
• Worked example for a hello-world agent: one function hello_world, 0.01 USDC, and an API to query past requests.

Why

Makes it easier for users to say “create an ACP agent that does X” and get both working code and the correct documentation link for each onboarding step.