Add README.md

Author: kateinoigakukun

README.md

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+# SwiftWasm
+
+## Compile your Swift code to WebAssembly
+
+[![Build Toolchain](https://github.com/swiftwasm/swiftwasm-build/actions/workflows/build-toolchain.yml/badge.svg)](https://github.com/swiftwasm/swiftwasm-build/actions/workflows/build-toolchain.yml) [![Discord](https://img.shields.io/discord/780838335798706197?label=Discord)](https://discord.gg/ashJW8T8yp)
+
+This is the distribution repository for SwiftWasm toolchain and SDK. Please refer to [the
+SwiftWasm book](https://swiftwasm.github.io/swiftwasm-book/) to get started, and to
+the [`awesome-swiftwasm`](https://github.com/swiftwasm/awesome-swiftwasm) list for
+more links in the SwiftWasm ecosystem.
+
+If you'd like to participate in the growing [SwiftWasm](https://swiftwasm.org) community, you're
+very welcome to join [our Discord server](https://discord.gg/ashJW8T8yp).
+
+
+The actual patches to the toolchain are maintained in the [`swiftwasm/swiftwasm-build`](https://github.com/swiftwasm/swiftwasm-build)
+repository. This repository is used only for distribution of the toolchain.
+
+If you'd like to track the status of our builds, please refer to our [GitHub Actions page](https://github.com/swiftwasm/swiftwasm-build/actions).