codemods: update README with new apply/list commands

Signed-off-by: Patrik Oldsberg <poldsberg@gmail.com>

packages/codemods/README.md

@@ -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 .