Create SECURITY.md

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 93.56%. Comparing base (5ddadb0) to head (51976e0).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #46 +/- ## ======================================= Coverage 93.56% 93.56% ======================================= Files 38 38 Lines 233 233 Branches 83 83 ======================================= Hits 218 218 Misses 14 14 Partials 1 1 ```

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