chore: add .git-files and SECURITY policy

.gitattributes

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+# Normalise line endings automatically for files detected as text by default.
+# That is: let the git installation on a user's machine decide
+# which line ending to use when a repository is checked out.
+# Subsequent lines may override this setting.
+*                                      text=auto
+
+# recognise file syntax during diff
+*.md                                   text diff=markdown
+*.sh                                   text diff=bash
+
+# force bash scripts to always use LF
+*.sh                                   text eol=lf
+
+# specify which files/dirs to ignore on [download ZIP] (not a git repo)
+.gitattributes                         export-ignore
+.gitignore                             export-ignore
+.github                                export-ignore

.gitignore

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+# macOS system files
+.DS_Store

CODEOWNERS

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+@AngryMaciek

SECURITY.md

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+# Security Policy
+
+This is free and unencumbered software released into the public domain.
+The author does not take any responsibility for security vulnerabilities
+which might arise as a result of its use.
+Please see the LICENSE file for more information.