Add usage

Author: zhenghaoz

README.md

@@ -16,15 +16,45 @@ composer require gorse/php-gorse
 
 ## Usage
 
-Insert feedback and get recommendations:
+Create a Gorse client:
 
 ```php
 $client = new Gorse("http://127.0.0.1:8088/", "api_key");
+```
+
+Insert users:
+
+```php
+$user = new User("100", ["gender" => "M", "age" => "25"], "my_comment");
+$rowsAffected = $client->insertUser($user);
+```
+
+Insert items:
+
+```php
+$item = new Item(
+    "2000", 
+    true, 
+    ["embedding" => [0.1, 0.2, 0.3]], 
+    ["Comedy", "Animation"], 
+    "2022-11-20T13:55:27Z", 
+    "Minions (2015)"
+);
+$rowsAffected = $client->insertItem($item);
+```
 
-$rowsAffected = $client->insertFeedback([
-    new Feedback("read", "10", "3", "2022-11-20T13:55:27Z"),
-    new Feedback("read", "10", "4", "2022-11-20T13:55:27Z"),
-]);
+Insert feedback:
 
-$client->getRecommend('10');
+```php
+$feedback = [
+    new Feedback("read", "100", "2000", 1.0, "2022-11-20T13:55:27Z"),
+    new Feedback("read", "100", "2001", 1.0, "2022-11-20T13:55:27Z"),
+];
+$rowsAffected = $client->insertFeedback($feedback);
+```
+
+Get recommendations:
+
+```php
+$items = $client->getRecommend('100', 10);
 ```