Add SECURITY.md file

[greschd]

Closes #869

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.96%. Comparing base (0b5bad3) to head (8340d65).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #871   +/-   ##
=======================================
  Coverage   94.96%   94.96%           
=======================================
  Files         110      110           
  Lines        5758     5758           
  Branches      293      293           
=======================================
  Hits         5468     5468           
  Misses        289      289           
  Partials        1        1           

Flag	Coverage Δ
direct-launch	92.18% <ø> (ø)
minimum-deps	93.06% <ø> (ø)
python-3.10	94.14% <ø> (ø)
python-3.11	94.07% <ø> (ø)
python-3.12	94.07% <ø> (ø)
python-3.13	94.32% <ø> (ø)
server-2024R2SP5	90.48% <ø> (ø)
server-2025R1SP4	94.11% <ø> (ø)
server-2025R2SP2	94.07% <ø> (ø)
server-2026R1	94.07% <ø> (ø)
server-latest	94.72% <ø> (ø)

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