add Mana Security app to Security Tools

[yugoslavskiy]

Types of Changes

What types of changes does your PR introduce?

• New addition to list
• Fixing bug in existing item in list
• Removing item from list
• Changing structure (organization) of list

Proposed Changes

Add an open source Vulnerability Management tool that helps to keep OS and Apps updated.

PR Checklist

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• I have read the CONTRIBUTING guide
• I have explained why this PR is important
• I have added necessary documentation (if appropriate)

Further Comments

None.