Chore: Added Snyk policy

[Berkmann18]

Checklist

• [x] The PR follows the guidelines
• [x] Passes all the tests (including added/updated ones)
• [x] Contains a valid documentation
• [x] It's not a duplicate from another PR

Changes

This PR implements:

• [ ] Bugfix
• [ ] Feature
• [ ] Refactoring
• [ ] Documentation/wiki/tutorial update
• [ ] Code style update
• [x] Build related change
• [ ] Other, please specify:

Details

What does this PR implements exactly? A snyk policy and the snyk test command.

[Berkmann18]

:tada: This PR is included in version 1.0.0 :tada:

The release is available on GitHub release

Your semantic-release bot :package::rocket: