Add milestone instructions in readme

Author: acogoluegnes

README.md

@@ -38,8 +38,51 @@ Or the following to `build.gradle` for Gradle:
 compile 'com.rabbitmq.jms:rabbitmq-jms:2.4.0'
 ```
 
-#### Snapshot
+#### Milestone
+
+Add the following to `pom.xml` for Maven:
+
+```xml
+<dependency>
+  <groupId>com.rabbitmq.jms</groupId>
+  <artifactId>rabbitmq-jms</artifactId>
+  <version>2.5.0.RC1</version>
+</dependency>
+```
+
+You need to declare the milestone repository as well:
+
+```xml
+<repositories>
+
+  <repositories>
+    <repository>
+      <id>packagecloud-rabbitmq-maven-milestones</id>
+      <url>https://packagecloud.io/rabbitmq/maven-milestones/maven2</url>
+      <releases><enabled>true</enabled></releases>
+      <snapshots><enabled>false</enabled></snapshots>
+    </repository>
+  </repositories>
+
+</repositories>
+```
+
+Or the following to `build.gradle` for Gradle:
+
+```groovy
+compile 'com.rabbitmq.jms:rabbitmq-jms:2.5.0.RC1'
+```
+
+You need to declare the milestone repository as well:
 
+```groovy
+repositories {
+  maven { url 'https://packagecloud.io/rabbitmq/maven-milestones/maven2' }
+  mavenCentral()
+}
+```
+
+#### Snapshot
 
 Add the following to `pom.xml` for Maven:
 
@@ -66,7 +109,6 @@ You need to declare the snapshot repository as well:
 </repositories>
 ```
 
-
 Or the following to `build.gradle` for Gradle:
 
 ```groovy