update README.md

create demo/artefacts.txt

update dev/solution.cs

delete Program.cs

create dev/solution.cs

delete PRD.md

update spec/codex.md

create spec/codex.md

update README.md

delete README.md

create REDME.md

update Program.cs

create Program.cs

create docs.md

update tasks.md

create tasks.md

update PRD.md

create PRD.md