add basic readme (#9)

Co-authored-by: Jacob Pratt <[email protected]>

README.md

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+# time-rs book
+
+[![Build](https://github.com/time-rs/book/actions/workflows/build.yaml/badge.svg?branch=main)](https://github.com/time-rs/book/actions/workflows/build.yaml)
+
+## `time` documentation
+
+This repository contains the [mdbook](https://github.com/rust-lang/mdBook) source for the [`time` crate](https://github.com/time-rs/time). The book can be viewed [here](https://time-rs.github.io/book).
+
+## Contributing
+
+Contributions are always welcome! If you have an idea, it's best to float it by me before working on
+it to ensure no effort is wasted. If there's already an open issue for it, knock yourself out. If not,
+open a new one.
+
+## License
+
+This project is licensed under either of
+
+- [Apache License, Version 2.0](https://github.com/time-rs/book/blob/main/LICENSE-Apache)
+- [MIT license](https://github.com/time-rs/book/blob/main/LICENSE-MIT)
+
+at your option.
+
+Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in
+time by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any
+additional terms or conditions.