Update stale example.

Author: kishorenc

README.md

@@ -2,30 +2,20 @@
 
 Java client library for accessing the HTTP API of [Typesense](https://typesense.org) search engine.
 
-## Installation
-
-The client is available on Maven Central.
-
-```
-<dependency>
-    <groupId>org.typesense</groupId>
-    <artifactId>typesense-java</artifactId>
-    <version>0.0.3</version>
-</dependency>
-```
+Note: This package is still under development. Some existing APIs might change or new APIs might be available in the future.
 
-You can also download the JAR file from the [releases](https://github.com/typesense/typesense-java/releases) section of this repository and add it to your project.
-
-## Usage
+## Installation
 
-### Import the packages
+Download the JAR file from the [releases](https://github.com/typesense/typesense-java/releases) section of this repository and add it to your project.
 
 ```java
 import org.typesense.api.*;
 import org.typesense.model.*;
 import org.typesense.resources.*;
 ```
 
+## Usage
+
 ### Create a new client
 ```java
 ArrayList<Node> nodes = new ArrayList<>();
@@ -90,8 +80,8 @@ client.collections("countries").documents().import_(documentList, queryParameter
 ```java
 SearchParameters searchParameters = new SearchParameters()
                                         .q("tokoyo")
-                                        .addQueryByItem("countryName").addQueryByItem("capital")
-                                        .addPrefixItem(true).addPrefixItem(false);
+                                        .queryBy("countryName,capital")
+                                        .prefix("true,false");
 SearchResult searchResult = client.collections("countries").documents().search(searchParameters);
 ```