chore(rust): add README for transport smoltcp crate

implementations/rust/ockam/ockam_transport_smoltcp/README

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+# ockam_transport_smoltcp
+
+[![crate][crate-image]][crate-link]
+[![docs][docs-image]][docs-link]
+[![license][license-image]][license-link]
+[![discuss][discuss-image]][discuss-link]
+
+Ockam is a library for building devices that communicate securely, privately
+and trustfully with cloud services and other devices.
+
+This crate provides a TCP Transport for Ockam's Routing Protocol using [smoltcp](github.com/smoltcp-rs/smoltcp).
+
+The Routing Protocol decouples Ockam's suite of cryptographic protocols,
+like secure channels, key lifecycle, credential exchange, enrollment etc. from
+the underlying transport protocols. This allows applications to establish
+end-to-end trust between entities.
+
+TCP is one possible transport for Routing Protocol messages, over time there
+will be more transport implementations.
+
+## Usage
+
+Add this to your `Cargo.toml`:
+
+```
+[dependencies]
+ockam_transport_smoltcp = "0.1.0"
+```
+
+This crate can work without `std`.
+
+## License
+
+This code is licensed under the terms of the [Apache License 2.0][license-link].
+
+[main-ockam-crate-link]: https://crates.io/crates/ockam
+[crate-image]: https://img.shields.io/crates/v/ockam_transport_tcp.svg
+[crate-link]: https://crates.io/crates/ockam_transport_tcp
+[docs-image]: https://docs.rs/ockam_transport_tcp/badge.svg
+[docs-link]: https://docs.rs/ockam_transport_tcp
+[license-image]: https://img.shields.io/badge/License-Apache%202.0-green.svg
+[license-link]: https://github.com/ockam-network/ockam/blob/HEAD/LICENSE
+[discuss-image]: https://img.shields.io/badge/Discuss-Github%20Discussions-ff70b4.svg
+[discuss-link]: https://github.com/ockam-network/ockam/discussions