Create SECURITY.md

[ranocha]

This shows that we're taking this open-source project seriously. It is considered to be a part of the best practices for open-source software. See trixi-framework/Trixi.jl#1884

You need to enable "Private vulnerability reporting" in the settings of this repository (Settings -> Code security and analysis, first item for me).

[coveralls]

Pull Request Test Coverage Report for Build 8410471226

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 96.312%

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Totals
Change from base Build 7752188989:	0.0%
Covered Lines:	444
Relevant Lines:	461

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💛 - Coveralls

[andrewwinters5000]

Thanks! I have activated the "Private vulnerability reporting".