Consider adding actual code of spec example somewhere in Readme #1022

https://github.com/Fission-AI/OpenSpec/#see-it-in-action has "See it in action" but actual spec powering this example are not seen anywhere

personally I am curious whether it is better than my current approach (presumably less structure instructions in markdown file(s)) - so I am curious how OpenSpec persistent prompt/specs/however you call it actually look like

maybe link specs of openspec if you use it on this repo?