Update README.md

Author: cleopatra27

README.md

@@ -43,7 +43,36 @@ Available features include:
 
 
 ## Installation
-To install the library,
+There are two ways to install this.
+
+## METHOD 1:
+Download RAVE-JAVA
+Download and add jar file as a Module to your Java project:
+
+Download from https://github.com/Flutterwave/Java/releases/latest
+
+On Intellij IDEA: File -> Project Structure -> Modules -> Dependencies Tab -> Add -> JARs or Directories -> Attach jar
+
+On Netbeans: Project properties -> Libraries -> Compile -> ADD JAR/folder -> Add Jar
+
+## METHOD 2:
+## Maven users
+Add this dependency to your project's POM: 
+
+```java
+<dependency>
+ <groupId>com.flutterwave</groupId>
+    <artifactId>f4b-java</artifactId>
+    <version>3.0</version>
+</dependency>
+```
+
+## Gradle users
+Add this dependency to your project's build file:
+
+```java
+compile("com.flutterwave:f4b-java:3.0")
+```
 
 
 ## Environment Variables