Documentation Improvement: Add Setup Instructions

## Overview

The README provides an excellent roadmap for the development of the Super-Todo project, but it currently lacks detailed setup instructions for beginners who may not be familiar with setting up a MERN stack application.

## Suggestion

I suggest expanding the documentation to include step-by-step setup instructions for the following:

1. Prerequisites (e.g., Node.js, npm, MongoDB, etc.)
2. Detailed instructions on how to initialize the npm workspaces and structure the project.
3. How to install dependencies for both the API and Web apps after cloning the repository.
4. Instructions on how to run the server and client-side applications locally, including any necessary environment variables.

This addition will greatly enhance the onboarding experience for new contributors and users, making it easier for them to get started with the project.

## Benefits
- New contributors can start contributing quickly without getting lost.
- Improves accessibility for users unfamiliar with the tech stack.

Let me know if this suggestion is welcome! 🍀

Start with the README and inspect the repository's API and Web workspace configuration to identify prerequisites, dependency-install commands, local run commands, and required environment variables. Expand the setup section with step-by-step instructions for cloning, initializing npm workspaces, installing dependencies, configuring the environment, and running both applications; done means a beginner can follow it successfully.

由索引模型根據 Issue 內容生成。