complate simple-todo-app

[efebaslilar]

Before creating this PR, please confirm the following:

• I have read the ReactPlay Contributor Guidelines and Discussion
• I have reviewed the ReactPlay Code Review Checklist
• I have tested my changes locally and verified there are no new warnings or errors

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First thing, PLEASE READ THIS: ReactPlay Code Review Checklist

Description

This PR adds a new play named "Simple Todo App".
It demonstrates the use of React fundamentals such as useState, props, and component composition.
Users can add, mark, and delete todos interactively.

This play is designed for beginners who want to understand how state and event handling work in React.

Fixes #

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Type of change

• New feature (non-breaking change which adds functionality)

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How Has This Been Tested?

• Verified the play runs successfully on localhost using yarn start
• Tested add, complete, and delete task actions
• No console errors or warnings observed
• Checked UI responsiveness and basic styling

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Checklist:

• I have performed a self-review of my own code
• I have commented my code where necessary
• I have followed the folder and naming conventions for plays
• My changes generate no new warnings
• The play functions as expected locally
• Added a proper README and play metadata

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Screenshots or example output

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Play Details

Field	Value
Name	Simple Todo App
Language	TypeScript
Style	CSS
Level	Beginner
Tags	Hooks, useState, Props, Component, Todo

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