Add documentation for handling key management and recovery processes

[sob-bedpost0q]

Overview

The cb-mpc repository provides critical MPC functionality, but it does not offer clear documentation on key management, recovery processes, or best practices for ensuring data security over time.

Problem Description

Developers using cb-mpc may be unsure about:

• how to securely store and manage keys
• what to do in case of key loss or compromise
• the best practices for key rotation and recovery

This lack of clarity can result in security risks or inefficiencies in handling cryptographic keys.

Expected Behavior

The documentation should provide guidance on:

• secure key storage practices
• how to manage key recovery and rotation
• best practices for ensuring the long-term safety of the MPC process

Proposed Solution

Add a dedicated documentation section that explains key management processes, including storage, recovery, and rotation, along with any security recommendations for developers.

Acceptance Criteria

• Clear documentation is added regarding key management and recovery.
• Security best practices are included to guide developers in implementing secure solutions.
• No changes to the runtime behavior of cb-mpc are required.