docs: usage with real backend

CONTRIBUTING.md

@@ -18,9 +18,14 @@
 - `ember test --server` – Runs the test suite in "watch mode"
 - `ember try:each` – Runs the test suite against multiple Ember versions
 
-## Running the dummy application
+## Running the dummy application (mirage backend)
 
-- `ember serve`
+- `yarn start`
 - Visit the dummy application at [http://localhost:4200](http://localhost:4200).
 
+## Running the dummy application (real backend)
+
+- set up `emeis` (see [docs](https://github.com/projectcaluma/emeis))
+- `yarn start-proxy`
+
 For more information on using ember-cli, visit [https://ember-cli.com/](https://ember-cli.com/).

package.json

@@ -20,6 +20,7 @@
     "lint:hbs": "ember-template-lint .",
     "lint:js": "eslint .",
     "start": "ember serve",
+    "start-proxy": "ember server --proxy http://localhost:8000",
     "test": "npm-run-all lint:* test:*",
     "test:ember": "ember test",
     "test:ember-compatibility": "ember try:each"