Adding mvux list view app showing how to select and update Items in a Mvux ListState

[DevTKSS]

• Add a seperate project showcasing how to add and update Items in a Mvux bound ListState Source in the Model
• Postproduce and upload the recorded Video
• Link Video to the Readme

[Copilot]

Pull Request Overview

This PR adds a new sample application "MvuxListApp" that demonstrates how to implement list selection and item modification using Uno Platform's MVUX framework. The app showcases binding to a ListState source and performing operations like renaming selected items.

Key changes:

• Created a complete MVUX sample application with list management functionality
• Added project configuration files and build settings for the new app
• Integrated the new project into the solution and workspace configuration

Reviewed Changes

Copilot reviewed 32 out of 35 changed files in this pull request and generated 7 comments.

File	Description
src/MvuxListApp/	Complete new sample application showcasing MVUX ListState operations
src/DevTKSS.Uno.Samples.sln	Added MvuxListApp project to solution
src/DevTKSS.Uno.SampleApps-Tutorials.slnf	Added MvuxListApp to solution filter
src/.vscode/	Updated VS Code configuration for debugging and building the new app

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