Set up project configuration: EditorConfig, Git attributes, devcontainer, Release Drafter, SECURITY.md, and README badges

SECURITY.md

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+# Security
+
+## Reporting a vulnerability
+
+If you find a security issue, please report it responsibly:
+
+1. **Do not** open a public issue.
+2. Email the maintainers or report via [GitHub Security Advisories](https://github.com/jakubbbdev/terminal-ui/security/advisories/new) (if enabled).
+3. Give a clear description and steps to reproduce; we’ll respond as soon as we can.
+
+Thank you for helping keep this project safe.