document new option to tempalte tag codemod

README.md

@@ -123,6 +123,10 @@ Edit `ember-cli-build.js`:
 ```js
 return require('@embroider/compat').templateTagCodemod(app, {
   shouldTransformPath: (path) => { return true; },
+  nameHint: (path) => { 
+    // example path: shared/my-button
+    return path; 
+  },
   dryRun: true,
 });
 ```
@@ -132,6 +136,7 @@ Requires optimized build (static* flags to be turned on)
 ### Options
 
 * `shouldTransformPath` - allows users to filter the templates that the code mod would run on
+* `nameHint` - optional function control the import name and template replacement values - valid JS identifier required or it will be coerced into one
 * `dryRun` - option can be used to obtain a summary of the changed the build would perform and which files it would act upon
 
 ### Limitations