docs: add stewardship readme

README.md

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+# car-fob-killer
+
+Repository placeholder for hardware security research materials.
+
+## Stewardship Status
+
+- Gitea repository was empty during the 2026-05-20 stewardship pass.
+- README initialized so the repo has a clear landing page.
+- Keep experiments limited to devices you own or are explicitly authorized to test.
+- Do not upload private captures, keys, firmware dumps, or target-specific data unless they are lawful and intentionally published.
+
+## Next Steps
+
+Add scope, hardware inventory, build process, test environment, license, and release policy before uploading code or binaries.