Making the example in README.md work

Also expanding the example to demonstrate how the id parameter is used

Author: salmasian

README.md

@@ -29,6 +29,8 @@ or run
 composer require chriskacerguis/codeigniter-restserver
 ```
 
+Note that you will need to copy `rest.php` to your `config` directory (e.g. `application/config`)
+
 Step 1: Add this to your controller (should be before any of your code)
 
 ```php
@@ -43,15 +45,18 @@ class Example extends RestController
 
 ## Basic GET example
 
-Here is a basic example of 
+Here is a basic example. This controller, which should be saved as `Api.php`, can be called in two ways:
+
+* `http://domain/api/users/` will return the list of all users
+* `http://domain/api/users/id/1` will only return information about the user with id = 1
 
 ```php
 <?php
 defined('BASEPATH') OR exit('No direct script access allowed');
 
 use chriskacerguis\RestServer\RestController;
 
-class Example extends REST_Controller {
+class Api extends RestController {
 
     function __construct()
     {
@@ -63,29 +68,43 @@ class Example extends REST_Controller {
     {
         // Users from a data store e.g. database
         $users = [
-            ['id' => 1, 'name' => 'John', 'email' => '[email protected]'],
-            ['id' => 2, 'name' => 'Jim', 'email' => '[email protected]'],
+            ['id' => 0, 'name' => 'John', 'email' => '[email protected]'],
+            ['id' => 1, 'name' => 'Jim', 'email' => '[email protected]'],
         ];
 
-        $id = $this->get('id');
+        $id = $this->get( 'id' );
 
-        if ($id === null)
+        if ( $id === null )
         {
             // Check if the users data store contains users
-            if ($users)
+            if ( $users )
             {
                 // Set the response and exit
-                $this->response($users, 200);
+                $this->response( $users, 200 );
             }
             else
             {
                 // Set the response and exit
-                $this->response([
+                $this->response( [
                     'status' => false,
                     'message' => 'No users were found'
-                ], 404);
+                ], 404 );
+            }
+        }
+        else
+        {
+            if ( array_key_exists( $id, $users ) )
+            {
+                $this->response( $users[$id], 200 );
+            }
+            else
+            {
+                $this->response( [
+                    'status' => false,
+                    'message' => 'No such user found'
+                ], 404 );
             }
         }
     }
 }
-```
+```