readme: add known uses of c2rust transpile (#1327)

Let me know if I missed any others and I can add them.

Author: kkysen

README.md

@@ -300,6 +300,23 @@ The translator and refactoring tool support both macOS and Linux.
 Other features, such as cross checking the functionality
 between C and Rust code, are currently limited to Linux hosts.
 
+## Uses of `c2rust transpile`
+
+This is a list of all significant uses of `c2rust transpile` that we know of:
+
+| Rust | C | By | Safety | Description |
+| - | -- | - | - | - |
+| [`rav1d`](https://github.com/memorysafety/rav1d/) | [`dav1d`](https://code.videolan.org/videolan/dav1d) | @memorysafety, @immunant | fully safe | AV1 decoder |
+| [`rexpat`](https://github.com/immunant/rexpat) | [`libexpat`](https://github.com/libexpat/libexpat) | @immunant | safety unfinished | streaming XML parser |
+| [`unsafe-libyaml`](https://github.com/dtolnay/unsafe-libyaml) | [`libyaml`](https://github.com/yaml/libyaml) | @dtolnay | minor cleanup, fully unsafe | YAML parser and writer used by [`serde_yaml`](https://github.com/dtolnay/serde-yaml)
+| [`libyaml-safer`](https://github.com/simonask/libyaml-safer) | [`libyaml`](https://github.com/yaml/libyaml) | @simonask | fully safe | safe fork of [`unsafe-libyaml`](https://github.com/dtolnay/unsafe-libyaml) |
+| [`libbzip2-rs`](https://github.com/trifectatechfoundation/libbzip2-rs) | [`bzip2`](https://gitlab.com/bzip2/bzip2) | @trifectatechfoundation | fully safe | file compression |
+| [`tsuki`](https://github.com/ultimaweapon/tsuki) | [`lua`](https://www.lua.org/source/5.4/) | @ultimaweapon | fully safe | Lua interpreter |
+| [`spiro.rlib`](https://github.com/MFEK/spiro.rlib) | [`spiro`](https://github.com/raphlinus/spiro) | @ctrlcctrlv | fully safe | spline interpolation |
+| [`sapp-kms`](https://crates.io/crates/sapp-kms) | [`sokol`](https://github.com/floooh/sokol) | @not-fl3 | cleaned up, still unsafe | application rendering library |
+
+If any other project successfully uses `c2rust`, feel free to add your ported project here.
+
 ## Acknowledgements and Licensing
 
 This material is available under the BSD-3 style license as found in the