message: readme: mention fizzy-wasi
diff: @@ -45,6 +45,26 @@ $ cmake --build .
  This will build Fizzy as a library and since there is no public API
  (the so called *embedder API* in WebAssembly) yet, this is not very useful.
  +## WASI
  +
  +Building with the `FIZZY_WASI` option will output a `fizzy-wasi` binary implementing
  +the [WASI] API (a very limited subset of [wasi_snapshot_preview1], to be precise).
  +It uses [uvwasi] under the hood. It can be used to execute WASI-compatible binaries on the command line.
  +
  +```sh
  +$ mkdir build && cd build
  +$ cmake -DFIZZY_WASI=ON ..
  +$ cmake --build .
  +```
  +
  +Try it with a Hello World example:
  +```sh
  +$ bin/fizzy-wasi ../test/smoketests/wasi/helloworld.wasm
  +hello world
  +```
  +
  +## Testing tools
  +
  Building with the `FIZZY_TESTING` option will output a few useful utilities:
  ```sh
  @@ -152,15 +172,19 @@ For a list of releases and changelog see the [CHANGELOG file](./CHANGELOG.md).
  Licensed under the [Apache License, Version 2.0].
  -[webassembly]: https://webassembly.org/
  +[webassembly]: https://webassembly.org
  [standard readme]: https://github.com/RichardLitt/standard-readme
  [circleci]: https://circleci.com/gh/wasmx/fizzy/tree/master
  -[codecov]: https://codecov.io/gh/wasmx/fizzy/
  +[codecov]: https://codecov.io/gh/wasmx/fizzy
  [Apache License, Version 2.0]: LICENSE
  [@axic]: https://github.com/axic
  [@chfast]: https://github.com/chfast
  [@gumb0]: https://github.com/gumb0
  +[WASI]: https://github.com/WebAssembly/WASI
  +[uvwasi]: https://github.com/cjihrig/uvwasi
  +[wasi_snapshot_preview1]: https://github.com/WebAssembly/WASI/blob/master/phases/snapshot/witx/wasi_snapshot_preview1.witx
  +
  [webassembly badge]: https://img.shields.io/badge/WebAssembly-Engine-informational.svg?logo=webassembly
  [readme style standard badge]: https://img.shields.io/badge/readme%20style-standard-brightgreen.svg
  [circleci badge]: https://img.shields.io/circleci/project/github/wasmx/fizzy/master.svg?logo=circleci
  