feat: add scripts for dojo management tasks

[iago-r]

This PR adds two scripts for:

• Creating new users and products via the DefectDojo API (create_users_and_products.py);
• Sending credentials by email to new users (send_emails.py);.

[cunha]

Check out https://marketplace.visualstudio.com/items?itemName=DavidAnson.vscode-markdownlint

[cunha]

Let break the e-mail sendingn function into a separate module that we can later import into other scripts.

This way I could use it to send other e-mails (e.g., like the welcome message I sent on Tuesday).

[cunha]

create_users script looks good, but it seems we need some additional code to split the vulnerabilities into different products.

[iago-r]

@cunha, I updated the scripts for the flow of:

• adding users, products and associating them;
• anonymizing the reports (encrypting_reports) -> for now a placeholder for @LeoOMaia 's script
• dividing the reports (partitioning_findings) -> for now a placeholder for @LeoOMaia 's script
• sending emails to users

With the possibility of skipping steps of the flow if necessary.