message: codemods: update README with new apply/list commands
diff: @@ -6,15 +6,27 @@ A collection of codemods for use with Backstage projects. They are intended to i
  This package is a wrapper around [`jscodeshift`](https://github.com/facebook/jscodeshift) with some included transforms. The transforms can either be executed via the included CLI or directly via `jscodeshift`.
  -To run the `core-imports` codemod towards all source files in a package, run the following:
  +To run the `core-imports` codemod towards all source files in the current directory, run the following:
  ```sh
  -npx @backstage/codemods core-imports .
  +npx @backstage/codemods apply core-imports
  ```
  Note that this will modify the source files directly, but it's possible to do a dry-run by adding the `--dry` flag.
  -The transforms are located within the `transforms/` directory in this package, so running directly with `jscodeshift` looks like this:
  +By passing a list of paths the codemod will only be applied to those paths:
  +
  +```sh
  +npx @backstage/codemods apply core-imports plugins/my-plugin-a plugins/my-plugin-b
  +```
  +
  +To print a list of all available transforms you use the `list` command:
  +
  +```sh
  +npx @backstage/codemods list
  +```
  +
  +You can also apply the transforms manually using `jscodeshift`. The transforms are located within the `transforms/` directory in this package, so running directly with `jscodeshift` looks like this:
  ```sh
  npx jscodeshift --parser=tsx --extensions=tsx,js,ts,tsx --transform=node_modules/@backstage/codemods/transforms/core-imports.js .
  