docs: add README for agents

[vprashar2929]

Add consolidated quick reference guide for AI agents contributing to
Kepler. Includes the development setup, testing instructions, PR
guidelines and project-specific context.

[SamYuan1990]

I am not sure if this agents.md too large.
can it reference to existing document?

[vprashar2929]

I am not sure if this agents.md too large. can it reference to existing document?

Updated the markdown

[vprashar2929]

@vimalk78 @KaiyiLiu1234 Should we also create symlink for CLAUDE.md as well?

[sunya-ch]

Looks good to me.
@vprashar2929 Can we add the instruction to ensure the content here and the one in docs/user such as https://github.com/sustainable-computing-io/kepler/blob/main/docs/user/installation.md#prerequisites (it seems not match now btw).

[vprashar2929]

Looks good to me. @vprashar2929 Can we add the instruction to ensure the content here and the one in docs/user such as https://github.com/sustainable-computing-io/kepler/blob/main/docs/user/installation.md#prerequisites (it seems not match now btw).

Good catch! You're absolutely right. I have updated AGENTS.md to maintain documentation consistency across all files to prevent this in the future.