Provide a cargo subcommand for NIH-plug's bundler

cargo_nih_plug/Cargo.toml

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+[package]
+name = "cargo-nih-plug"
+version = "0.1.0"
+edition = "2021"
+authors = ["Robbert van der Helm <mail@robbertvanderhelm.nl>"]
+description = "A cargo subcommand for compiling and bundling plugins, analogous to NIH-plug's `cargo xtask`"
+license = "ISC"
+
+[dependencies]
+nih_plug_xtask = { path = "../nih_plug_xtask" }

cargo_nih_plug/README.md

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+# NIH-plug: cargo subcommand for bundling plugins
+
+This is NIH-plug's `cargo xtask` command, as a `cargo` subcommand. This way you
+can use it outside of NIH-plug projects. If you're using NIH-plug, you'll want
+to use the xtask integration directly instead, see:
+<https://github.com/robbert-vdh/nih-plug/tree/master/nih_plug_xtask>.
+
+Since this has not yet been published to `crates.io`, you'll need to install
+this using:
+
+```shell
+cargo install --git https://github.com/robbert-vdh/nih-plug.git cargo-nih-plug
+```

cargo_nih_plug/src/main.rs

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+fn main() -> nih_plug_xtask::Result<()> {
+    // This includes both the `cargo` command and the `nih-plug` subcommand, so we should get rid of
+    // those first
+    let args = std::env::args().skip(2);
+    nih_plug_xtask::main_with_args(args)
+}