Add more templates READMEs

Author: djhi

packages/create-react-admin/templates/local-auth-provider/README.md

@@ -1,4 +1,8 @@
 ## Authentication
 
 The included auth provider should only be used for development and test purposes.
-You'll find a `users.json` file in the `src` directory that includes the users you can use.
+You'll find a `users.json` file in the `src` directory that includes the users you can use.
+
+You can sign in to the application with the following usernames and password:
+- janedoe / password
+- johndoe / password

packages/create-react-admin/templates/ra-data-fakerest/README.md

@@ -2,3 +2,7 @@
 
 The included data provider use [FakeREST](https://github.com/marmelab/fakerest) to simulate a backend.
 You'll find a `data.json` file in the `src` directory that includes some fake data for testing purposes.
+
+It includes two resources, posts and comments.
+Posts have the following properties: `id`, `title` and `content`.
+Comments have the following properties: `id`, `post_id` and `content`.

packages/create-react-admin/templates/ra-data-json-server/README.md

@@ -0,0 +1,5 @@
+## DataProvider
+
+The included data provider use [ra-data-json-server](https://github.com/marmelab/react-admin/tree/master/packages/ra-data-json-server). It fits REST APIs powered by [JSON Server](https://github.com/typicode/json-server), such as [JSONPlaceholder](https://jsonplaceholder.typicode.com/).
+
+You'll find an `.env` file at the project root that includes a `VITE_JSON_SERVER_URL` variable. Set it to the URL of your backend. By default, we set it to targets [JSONPlaceholder](https://jsonplaceholder.typicode.com/).

packages/create-react-admin/templates/ra-data-simple-rest/README.md

@@ -0,0 +1,5 @@
+## DataProvider
+
+The included data provider use [ra-data-simple-rest](https://github.com/marmelab/react-admin/tree/master/packages/ra-data-simple-rest). It fits REST APIs using simple GET parameters for filters and sorting. This is the dialect used for instance in [FakeRest](https://github.com/marmelab/FakeRest).
+
+You'll find an `.env` file at the project root that includes a `VITE_JSON_SERVER_URL` variable. Set it to the URL of your backend.