feat(workflows): Update create-pr.md workflow instructions

[xunma]

Summary

This PR updates the .pochi/workflows/create-pr.md file to include more detailed instructions for creating a pull request.

Specifically, it adds:

• A guideline to ask for an issue number if one is not provided.
• A clarification to write a meaningful PR description, in addition to the title and commit message.

🤖 Generated with Pochi

[xunma]

Result

This is how it works when:

• An issue number is provided when triggering the workflow: https://app.getpochi.com/tasks/VyFLAoEI
• An issue number is provided after Pochi asks: https://app.getpochi.com/share/g9mCjLdj
• No issue number provided: https://app.getpochi.com/tasks/N0JVWDKH

[wsxiaoys]

give an option of askFollowUpQuestion that help user find the issue. (have issue / no issue / find issue for me)

[xunma]

@wsxiaoys nice suggestion. it works well 👉 https://app.getpochi.com/tasks/jUcSdiIW

only minor thing is, when user select find issue for me, the output by default is collapsed — user needs to manually open it to see the full issue list. I think it wouldn't be a big issue, as the user of this workflow should know they can open the list..

[wsxiaoys]

you can optimize prompt to make it generates better output and confirm it with user.

[xunma]

@wsxiaoys okie! I specified the output format(not sure if I am being too specific here...)

When choosing find issue for me:

• By default, Pochi displays two lists -- issues assigned to me & the 10 latest issues: https://app.getpochi.com/tasks/P5Ci8b4K

• User can provide a keyword to search for issues: https://app.getpochi.com/tasks/GIagZ36M