[Docs] Improve documentation for reproducible runs using seed

[alizahh-7]

The README briefly mentions an optional seed field in the sample configuration, but there is no clear documentation explaining how reproducible runs work in Krkn-AI.

After the recent addition of configurable seed support, it would be helpful to:

• Explain what the seed is used for and why it matters
• Document how to use --seed from the CLI
• Clarify how the seed is stored/logged in the output for reproducibility
• Add a short example showing two runs with the same seed producing consistent behavior

This would make the feature more discoverable and easier to use, especially for new users.

[alizahh-7]

Hi @rh-rahulshetty 👋
I’ve added documentation for the configurable seed feature to improve clarity around reproducible runs.

Could you please take a look at PR #138 when you get a chance?
Thanks!