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Add CodeBoarding documentation

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```mermaid
graph LR
SessionInterface["SessionInterface"]
SecureCookieSessionInterface["SecureCookieSessionInterface"]
NullSession["NullSession"]
SecureCookieSessionInterface -- "implements" --> SessionInterface
SessionInterface -- "creates" --> NullSession
```
[![CodeBoarding](https://img.shields.io/badge/Generated%20by-CodeBoarding-9cf?style=flat-square)](https://github.com/CodeBoarding/GeneratedOnBoardings)[![Demo](https://img.shields.io/badge/Try%20our-Demo-blue?style=flat-square)](https://www.codeboarding.org/demo)[![Contact](https://img.shields.io/badge/Contact%20us%20-%20codeboarding@gmail.com-lightgrey?style=flat-square)](mailto:codeboarding@gmail.com)
## Component Details
The Sessions component in Flask manages user sessions, allowing applications to store and retrieve user-specific data across multiple requests. It relies on the `SessionInterface` to define the session management behavior, with `SecureCookieSessionInterface` providing a secure cookie-based implementation. The component handles session creation, storage, retrieval, and security, ensuring that session data is protected from unauthorized access. When session creation fails, a `NullSession` is used.
### SessionInterface
Defines the interface for implementing session management in Flask. It provides methods for creating, opening, and saving sessions. Custom session storage mechanisms can be implemented by subclassing this interface.
- **Related Classes/Methods**: `flask.src.flask.sessions.SessionInterface` (114:284), `flask.src.flask.sessions.SessionInterface:make_null_session` (164:174)
### SecureCookieSessionInterface
Implements session management using secure cookies. It serializes the session data, signs it cryptographically, and stores it in a cookie. This ensures that the session data cannot be tampered with by the client. It extends the SessionInterface.
- **Related Classes/Methods**: `flask.src.flask.sessions.SecureCookieSessionInterface` (298:399), `flask.src.flask.sessions.SecureCookieSessionInterface:open_session` (337:349), `flask.src.flask.sessions.SecureCookieSessionInterface:save_session` (351:399)
### NullSession
Represents a session that does not store any data. It is returned by make_null_session when session creation fails.
- **Related Classes/Methods**: `flask.src.flask.sessions.NullSession` (97:111)