docs(README): initial version

Author: gr2m

README.md

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+# 🚧 WORK IN PROGRESS. See [#1](https://github.com/octoherd/script-rename-master-branch-to-main/pull/1) | [Preview](https://github.com/octoherd/script-rename-master-branch-to-main/tree/initial-version)
+
+# script-rename-master-branch-to-main
+
+> Renames the default branch to main if it is currently set to master
+
+## Contributing
+
+See [CONTRIBUTING.md](CONTRIBUTING.md)
+
+## About Octoherd
+
+[@octoherd](https://github.com/octoherd/) is project to help you keep your GitHub repositories in line.
+
+## License
+
+[ISC](LICENSE.md)