This is learning of Rust Actix Web

I learned:

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• How to build a REST API using Actix Web.
• How to use Mutex for safe shared state in a web server.
• How to implement CRUD operations for tasks and users.
• How to serialize and deserialize data with Serde.
• How to persist data to a JSON file.
• How to handle CORS in Actix Web.
• How to structure a Rust web project.

Features

• Task management: create, read, update, delete tasks.
• User management: add users, query by username.
• Persistent storage using database.json.
• Simple authentication logic (username/password).
• CORS support for frontend integration.

How to run

cargo run

API Endpoints

• GET /task - List all tasks
• POST /task - Create a new task
• PUT /task - Update a task
• GET /task/{id} - Read a task by id
• DELETE /task/{id} - Delete a task
• POST /register - Add a user
• POST /login - Log in

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