Add boilerplate for Safety Limiter

plugins/safety_limiter/README.md

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+# Safety Limiter
+
+This plugin is a simple tool to prevent ear damage. As soon as there is a peak
+above 0 dBFS or the specified threshold, the plugin will cut over to playing SOS
+in Morse code, gradually fading out again when the input returns back to safe
+levels. Made for personal use during plugin development and intense sound design
+sessions, but maybe you'll find it useful too!
+
+**Why not use a regular brickwall peak limiter?**  
+The downside of doing that is that you may end up mixing or doing sound design
+into that limiter without realizing it. And at that point, you'll probably need
+to either redo part of the process. So this plugin simply gives you a very
+non-subtle heads up instead of altering the sound.
+
+## Download
+
+You can download the development binaries for Linux, Windows and macOS from the
+[automated
+builds](https://github.com/robbert-vdh/nih-plug/actions/workflows/test.yml?query=branch%3Amaster)
+page. Or if you're not signed in on GitHub, then you can also find the latest nightly
+build [here](https://nightly.link/robbert-vdh/nih-plug/workflows/build/master).
+
+The macOS version has not been tested and may not work correctly. You may also
+have to [disable Gatekeeper](https://disable-gatekeeper.github.io/) to use the
+VST3 version as Apple has recently made it more difficult to run unsigned code
+on macOS.
+
+### Building
+
+After installing [Rust](https://rustup.rs/), you can compile Safety Limiter as
+follows:
+
+```shell
+cargo xtask bundle puberty_simulator --release
+```