Update readme.md

[IamLucif3r]

• Added few tools for container security
• Added a tool in secret-management

[JakobTheDev]

Hi @IamLucif3r, thanks for the suggestions.

Can you please review the contribution guidelines and update your PR to suit, in particular make sure that:

• Your suggestion is not already in the list. (HashiCorp Vault s already listed)
• Your pull request contains only one suggestion.
• Suggestions are in the format Resource - Maintainer
• Resources within a group are alphabetised.

Thanks!