chore: add documentation for ./scripts/link

Author: stainless-app[bot]

README.md

@@ -118,3 +118,23 @@ base64-encoding). Note that absolute paths will begin with `@file://` or
 ```bash
 beeper-desktop-cli <command> --arg @data://file.txt
 ```
+
+## Linking different Go SDK versions
+
+You can link the CLI against a different version of the Beeper Desktop Go SDK
+for development purposes using the `./scripts/link` script.
+
+To link to a specific version from a repository (version can be a branch,
+git tag, or commit hash):
+
+```bash
+./scripts/link github.com/org/repo@version
+```
+
+To link to a local copy of the SDK:
+
+```bash
+./scripts/link ../path/to/beeperdesktopapi-go
+```
+
+If you run the link script without any arguments, it will default to `../beeperdesktopapi-go`.