Branch, Build Setup, Review, Guidelines

[singhashish-wpf]

• [x] Setup a new branch for win11theming feature
• [x] Setup the build pipeline on the feature branch
• [ ] Add setup to run relevant tests
• [ ] Set up code review guidelines
• [ ] Setup a process to get the changes inside.

Branch setup for Win11Theming feature -

• feature/win11theming/staging : Used as staging area for merging changes ported from WinUI
• feature/win11theming/main: To be used when API reviews and corresponding implementation changes are updated.
• feature/win11theming/release: To be used when the changes are completely tested ensuring the newer styling and API changes are working as expected.

Once we have end-to-end feature readiness, we will merge it to main branch. This would make it to .NET 9 preview releases.