Feature: Add scripts for easier user management (add/remove users)

[velrino]

Description

I've added two bash scripts to simplify the user management process in AlgoVPN.

The first script allows for automatically adding new users to the configuration file.
The second script makes it easy to remove existing users from the configuration file.
These scripts help avoid manual edits to the configuration file, making user management more efficient and reducing the risk of errors

Motivation and Context

My motivation for adding these scripts was to streamline the process of managing users in AlgoVPN. By automating the addition and removal of users in the configuration file, the process becomes faster and less error-prone, improving efficiency in managing VPN users

How Has This Been Tested?

Both scripts have been tested locally by adding and removing several users from the configuration file. The scripts were executed in a variety of scenarios to ensure that users are added correctly and removed without affecting other parts of the configuration file.

When run ./add-user.sh example

When run ./remove-user.sh example

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist:

• I have read the CONTRIBUTING document.
• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.

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