docs(#90): cross link yet another addon

- ember-array-map-resource

README.md

@@ -596,6 +596,7 @@ test('my test', async function (assert) {
 List of addons that use and wrap `ember-resources` to provide more specific functionality:
 
 - [ember-data-resources](https://github.com/NullVoxPopuli/ember-data-resources) - resources for reactive data fetching with ember-data
+- [ember-array-map-resource](https://github.com/NullVoxPopuli/ember-array-map-resource) - provides a useArrayMap function which returns a resource that reactively maps data per-element, so that when the overall collection is dirtied, only the changed/new/removed elements affect the mapped collection
 
 ## Contributing