doc: added README.md (#4)

Author: sttk

README.md

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+# [sabi-rust][repo-url] [![crate.io][crateio-img]][crateio-url] [![doc.rs][docrs-img]][docrs-url] [![CI Status][ci-img]][ci-url] [![MIT License][mit-img]][mit-url]
+
+A small framework to separate logics and data accesses for Rust application.
+
+
+## Supporting Rust versions
+
+This crate supports Rust 1.80.1 or later.
+
+```
+% cargo msrv --no-check-feedback
+Fetching index
+Determining the Minimum Supported Rust Version (MSRV) for toolchain x86_64-apple-darwin
+Using check command cargo check
+   Finished The MSRV is: 1.80.1   ████████████████████████████████████████████ 00:00:29
+```
+
+## License
+
+Copyright (C) 2024 Takayuki Sato
+
+This program is free software under MIT License.<br>
+See the file LICENSE in this distribution for more details.
+
+
+[repo-url]: https://github.com/sttk/sabi-rust
+[crateio-img]: https://img.shields.io/badge/crate.io-ver.0.0.1-fc8d62?logo=rust
+[crateio-url]: https://crates.io/crates/sabi-rust
+[docrs-img]: https://img.shields.io/badge/doc.rs-sabi_rust-66c2a5?logo=docs.rs
+[docrs-url]: https://docs.rs/sabi-rust
+[ci-img]: https://github.com/sttk/sabi-rust/actions/workflows/rust.yml/badge.svg?branch=main
+[ci-url]: https://github.com/sttk/sabi-rust/actions?query=branch%3Amain
+[mit-img]: https://img.shields.io/badge/license-MIT-green.svg
+[mit-url]: https://opensource.org/licenses/MIT