Docs: Add supported operating system section (#255)

docusaurus/docs/getting-started.mdx

@@ -39,6 +39,13 @@ Plugins previously scaffolded with `@grafana/toolkit` can be migrated. Please se
 - Optionally [Yarn 1](https://classic.yarnpkg.com/lang/en/docs/install) or [PNPM](https://pnpm.io/installation)
 - [Docker](https://docs.docker.com/get-docker/)
 
+### Supported Operating Systems
+Create Plugin currently supports the following operating systems:
+
+- Linux
+- macOS
+- Windows 10+ with WSL (Windows Subsystem for Linux)
+
 ### Choosing a package manager
 Starting from v1.3 of Create Plugin when you create a new plugin, the CLI will use `npm`, `pnpm` or `yarn` depending on which tool you use to run `@grafana/create-plugin`.