add security.md

[masc2023]

Add SECURITY.MD to score repo according new Eclipse Guideline

[github-actions]

The created documentation from the pull request is available at: docu-html

[4og]

I would keep the security policy centrally in .github repo
eclipse-score/.github#79

[masc2023]

I would keep the security policy centrally in .github repo eclipse-score/.github#79

Is that populated automatically to other repos?

[masc2023]

I would keep the security policy centrally in .github repo eclipse-score/.github#79

Compare here,
https://github.com/microsoft/apm/blob/main/SECURITY.md
points to the security.md in .github, so seems not be populated, so I assume needs to be in each repo

[4og]

Github automatically redirects to to the policy in eclipse-score/.github if SECURITY.md file is missing in a repo. I checked, it's in all S-CORE repos like this.

E.g. in score repo:

[FScholPer]

The file needs to be in EVERY repo. Please decide if we want to maintain the content in score / .github repo and only reference the content there