Update README.md to add security clarification

[EazyAl]

updated readme for security alignment

Pull Request

We aren't following MCP best practice - this is clarified in the PR

Related issue

Fixes #<issue_number>

What does this PR do?

• Added details on security

PR checklist

Please check if your PR fulfills the following requirements:

• [x ] Does this PR fix an existing issue, or have you listed the changes applied in the PR description (and why they are needed)?
• Have you read the contributing guidelines?
• [x ] Have you made sure that the title is accurate and descriptive of the changes?

Thank you so much for contributing to Meilisearch!

[tpayet]

Thanks for adding that :)