Build out README and CONTRIBUTING docs (#21)

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CONTRIBUTING.md

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+# Contributing to Temporal in Rust
+
+This project is currently highly experimental and fairly volatile. As such, while we do
+welcome contributions, we prefer that you open up an issue first beforehand to ensure
+the feature is not being actively worked on by a maintainer.
+
+If you're interested in helping out but don't see an issue that's for you, please feel free to contact
+us on the `Boa` discord.
+
+## Contributor Information
+
+`Temporal` is a new date/time API that is being developed and proposed for the `ECMAScript`
+specification. This library aims to be a `Rust` implementation of that specification.
+
+Due to the current experimental nature of the material and this library, we would advise
+potential contributors to familiarize themselves with the Temporal specification.

README.md

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 # Temporal in Rust
 
-Provides a standard API for working with dates and time.
+:warning: This crate is highly experimental and NOT stable. We cannot make any guarantee that the API will be stable until `0.1.0`. Do not use in production without extreme caution :warning:
 
-IMPORTANT NOTE: The Temporal Proposal is still in Stage 3. As such, this crate should be viewed
-as highly experimental until the proposal has been completely standardized and released.
+`Temporal` is a calendar and timezone aware date/time library that is currently being designed and proposed as a new
+builtin to the `ECMAScript` specification.
 
-## Goal
+This crate is an implementation of `Temporal` in Rust. While initially developed for the `Boa`, the crate has been externalized
+as we intended to make an engine agnostic and general usage implementation of `Temporal` and its algorithms.
 
-The intended goal of this crate is to provide an engine agnostic
-implementation of `ECMAScript`'s Temporal algorithms.
+## Temporal Proposal
+
+Relevent links regarding Temporal can be found below.
+
+-[Temporal Documentation](https://tc39.es/proposal-temporal/docs/)
+-[Temporal Specification](https://tc39.es/proposal-temporal/)
+-[Temporal Repository](https://github.com/tc39/proposal-temporal)
+
+## Contributing
+
+This project is open source and welcomes anyone interested to participate. Please see [CONTRIBUTING.md](./CONTRIBUTING.md) for more information.
+
+## Communication
+
+Feel free to contact us on [Discord](https://discord.gg/tUFFk9Y).
+
+## License
+
+This project is licensed under the [Apache](./LICENSE-Apache) or [MIT](./LICENSE-MIT) licenses, at your option.