Add routing-forms README (#6506)

packages/app-store/ee/routing-forms/README.md

@@ -0,0 +1,7 @@
+# Routing Forms App
+
+## How to run Tests
+
+`yarn e2e:app-store` runs all Apps' tests. You can use `describe.only()` to run Routing Forms tests only.
+
+Make sure that the app is running already with NEXT_PUBLIC_IS_E2E=1 so that the app is installable