docs: add readme

README.md

@@ -0,0 +1,19 @@
+# Rust Cargo Plugin
+
+This is a plugin for [Universal Changesets](https://github.com/universal-changesets/core) that allows you to get/set the version of your Rust project via the `Cargo.toml` file.
+
+## Usage
+
+To use this plugin, you need to reference it within the `.changeset/config.json` file:
+
+```json
+{
+  "$schema": "https://raw.githubusercontent.com/universal-changesets/core/main/changeset-config.schema.json",
+  "plugin": {
+    "sha256": "e63c184c019d2198b497ceeaefeb59587da138ca7f78edc34e21332a7cc4b18c",
+    "url": "gh:universal-changesets/[email protected]"
+  }
+}
+```
+
+Once you've done that, you can use the `changeset get` and `changeset version` functions in your project. Refer to the [documentation](https://github.com/universal-changesets/core/blob/main/docs/plugins.md) for more information.