Update README [skip ci]

Author: algoliareadmebot

README.md

@@ -10,12 +10,16 @@ your Android code.
 _Note: If you were using **version 2.x** of our Android client, read the [migration guide to version 3.x](https://github.com/algolia/algoliasearch-client-android/wiki/Migration-guide-to-version-3.x)._
 
 
-You can browse the automatically generated [reference documentation](https://community.algolia.com/algoliasearch-client-android/).
+
+  ## Contributing
+
+  You can browse the automatically generated [reference documentation](https://community.algolia.com/algoliasearch-client-android/).
 
 This project is open-source under the [MIT License](https://github.com/algolia/algoliasearch-client-android/blob/master/LICENSE).
 
 
 
+
 ## Contributing
 
 [Your contributions](https://github.com/algolia/algoliasearch-client-android/pull/new) are welcome! Please use our [formatting configuration](https://github.com/algolia/CodingStyle#android) to keep the coding style consistent.
@@ -81,7 +85,7 @@ To start, you need to initialize the client. To do this, you need your **Applica
 You can find both on [your Algolia account](https://www.algolia.com/api-keys).
 
 ```java
-Client client = new Client("YourApplicationID", "YourAPIKey");
+Client client = new Client("YourApplicationID", "YourAdminAPIKey");
 Index index = client.getIndex("your_index_name");
 ```
 
@@ -112,7 +116,7 @@ index.addObjectAsync(new JSONObject()
 You can customize settings to fine tune the search behavior. For example, you can add a custom ranking by number of followers to further enhance the built-in relevance:
 
 ```java
-JSONObject settings = new JSONObject().append("customRanking", "desc(followers)");
+JSONObject settings = new JSONObject().put("customRanking", "desc(followers)");
 index.setSettingsAsync(settings, null);
 ```
 
@@ -302,6 +306,12 @@ index.searchAsync(new Query("jimmie paint"), completionHandler);
 
 
 
+### Vault
+
+
+
+
+
 
 ## Getting Help