feat: README (#207)

### Description

Updates the `op-alloy` readme, following the layout of
[alloy](https://github.com/alloy-rs/alloy).

README.md

@@ -1,18 +1,99 @@
-# OP-Alloy
+# op-alloy
 
-Optimism [alloy](https://github.com/alloy-rs/alloy) types.
+<a href="https://github.com/alloy-rs/op-alloy/actions/workflows/ci.yml"><img src="https://github.com/alloy-rs/op-alloy/actions/workflows/ci.yml/badge.svg?label=ci" alt="CI"></a>
+<a href="https://github.com/alloy-rs/op-alloy/blob/main/LICENSE-APACHE"><img src="https://img.shields.io/badge/License-APACHE-d1d1f6.svg?label=license&labelColor=2a2f35" alt="License"></a>
+<a href="https://github.com/alloy-rs/op-alloy/blob/main/LICENSE-MIT"><img src="https://img.shields.io/badge/License-MIT-d1d1f6.svg?label=license&labelColor=2a2f35" alt="License"></a>
+<a href="https://alloy-rs.github.io/op-alloy"><img src="https://img.shields.io/badge/Contributor%20Book-854a15?logo=mdBook&labelColor=2a2f35" alt="Book"></a>
 
-#### License
+Transports, Middleware, and Networks for Optimism built with [Alloy][alloy].
+
+
+## Usage
+
+The following crates are provided by `op-alloy`.
+
+- [`op-alloy-consensus`][op-alloy-consensus]
+- [`op-alloy-genesis`][op-alloy-genesis]
+- [`op-alloy-network`][op-alloy-network]
+- [`op-alloy-protocol`][op-alloy-protocol]
+- [`op-alloy-provider`][op-alloy-provider]
+- [`op-alloy-rpc-jsonrpsee`][op-alloy-rpc-jsonrpsee]
+- [`op-alloy-rpc-types-engine`][op-alloy-rpc-types-engine]
+- [`op-alloy-rpc-types`][op-alloy-rpc-types]
+
+
+## Supported Rust Versions (MSRV)
+
+The current MSRV (minimum supported rust version) is 1.81.
+
+Unlike Alloy, op-alloy may use the latest stable release,
+to benefit from the latest features.
+
+The MSRV is not increased automatically, and will be updated
+only as part of a patch (pre-1.0) or minor (post-1.0) release.
+
+
+## Contributing
+
+op-alloy is built by open source contributors like you, thank you for improving the project!
+
+A [contributing guide][contributing] is available to help you get started to contribute to op-alloy.
+
+Pull requests will not be merged unless CI passes, so please ensure that your contribution follows the
+linting rules and passes clippy.
+
+
+## `no_std`
+
+op-alloy is intended to be `no_std` compatible, initially for use in [kona][kona].
+
+The following crates support `no_std`.
+Notice, provider crates do not support `no_std` compatibility.
+
+- `op-alloy-consensus`
+- `op-alloy-genesis`
+- `op-alloy-protocol`
+- `op-alloy-genesis`
+- `op-alloy-rpc-types`
+- `op-alloy-rpc-types-engine`
+
+If you would like to add no_std support to a crate,
+please make sure to update [scripts/check_no_std.sh][check-no-std].
+
+
+## Credits
+
+op-alloy is inspired by the work of several teams and projects, most notably [the Alloy project][alloy].
+
+op-alloy would not be possible without the contributions from open source contributors. Thank you.
+
+
+## License
 
-<sup>
 Licensed under either of <a href="LICENSE-APACHE">Apache License, Version
 2.0</a> or <a href="LICENSE-MIT">MIT license</a> at your option.
-</sup>
-
-<br>
 
 <sub>
 Unless you explicitly state otherwise, any contribution intentionally submitted
 for inclusion in these crates by you, as defined in the Apache-2.0 license,
 shall be dual licensed as above, without any additional terms or conditions.
 </sub>
+
+<!-- Hyperlinks -->
+
+[check-no-std]: ./scripts/check_no_std.sh
+
+[contributing]: https://alloy-rs.github.io/op-alloy
+
+[kona]: https://github.com/anton-rs/kona
+
+[alloy]: https://github.com/alloy-rs/alloy
+
+[op-alloy-consensus]: https://crates.io/crates/op-alloy-consensus
+[op-alloy-genesis]: https://crates.io/crates/op-alloy-genesis
+[op-alloy-network]: https://crates.io/crates/op-alloy-network
+[op-alloy-protocol]: https://crates.io/crates/op-alloy-protocol
+[op-alloy-provider]: https://crates.io/crates/op-alloy-provider
+[op-alloy-rpc-jsonrpsee]: https://crates.io/crates/op-alloy-rpc-jsonrpsee
+[op-alloy-rpc-types-engine]: https://crates.io/crates/op-alloy-rpc-types-engine
+[op-alloy-rpc-types]: https://crates.io/crates/op-alloy-rpc-types