Add bulk user import functionality from CSV

[stephdl]

Introduce a new script for creating synchronization tasks from a CSV file containing user credentials. Include an initial users.csv file with sample data and update the README to document the new bulk import feature and its usage.

asked by @nrauso
NethServer/dev#7791

[Copilot]

Pull request overview

This PR adds bulk user import functionality to create multiple IMAP synchronization tasks from a CSV file. The implementation includes a Python script that reads user credentials from CSV, validates the input, and calls the existing API to create tasks programmatically.

Key changes:

• New create_tasks_from_csv.py script with CSV parsing, validation, and batch task creation capabilities
• Sample users.csv file with 5 example user records demonstrating the expected format
• Documentation in README.md covering CSV format, usage examples, and feature descriptions

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 14 comments.

File	Description
users.csv	Sample CSV file with 5 user records showing the required column structure and format
create_tasks_from_csv.py	Main Python script implementing CSV parsing, validation, delimiter detection, and API integration for bulk task creation
README.md	Documentation section covering bulk import usage, CSV format requirements, command-line options, and example output

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[Copilot]

Pull request overview

Copilot reviewed 3 out of 3 changed files in this pull request and generated 13 comments.

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[Copilot]

Pull request overview

Copilot reviewed 3 out of 3 changed files in this pull request and generated 10 comments.

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[Copilot]

@stephdl I've opened a new pull request, #64, to work on those changes. Once the pull request is ready, I'll request review from you.

[Copilot]

@stephdl I've opened a new pull request, #65, to work on those changes. Once the pull request is ready, I'll request review from you.

[DavidePrincipi]

LGTM, it's a nice feature: let's document it in the Admin's manual too.