chore: update README

README.md

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+# rust-hdl-bsp-step-mxo2-lpc
+
+[![ci icon][]][ci link] [![crates.io icon][]][crates.io link]
+
+`rust-hdl` board support package for STEP-MXO2-LPC
+
+- [x] LED * 8
+- [x] DIP switch * 4
+- [x] Keys * 4
+- [x] 7-segment display * 2
+
+[crates.io link]: https://crates.io/crates/rust-hdl-bsp-step-mxo2-lpc
+[crates.io icon]: https://img.shields.io/crates/v/rust-hdl-bsp-step-mxo2-lpc.svg?style=flat-square
+[ci link]: https://github.com/y5c4l3/rust-hdl-bsp-step-mxo2-lpc
+[ci icon]: https://img.shields.io/github/actions/workflow/status/y5c4l3/rust-hdl-bsp-step-mxo2-lpc/rust.yml?branch=main&style=flat-square