add rocketSend function

vars/rocketSend.groovy

@@ -0,0 +1,32 @@
+final ROCKET_ALIAS = "Jenkins"
+
+def void call(String webHook, String message, String channel = null, String avatar = null, Boolean rawMessage = true) {
+    Map data = [:] as Map
+    data['alias'] = ROCKET_ALIAS
+    data['text'] = message
+    data['rawMessage'] = rawMessage
+
+    if (channel != null) {
+        data['channel'] = channel
+    }
+
+    if (avatar != null) {
+        data['avatar'] = avatar
+    }
+
+    def returnCode = sh(returnStatus: true, script: 
+    '''
+    curl
+        -X POST "${webHook}"
+        -H "Content-Type: application/json"
+        --data "${groovy.json.JsonOutput.toJson(data)}"
+        --fail '
+    '''
+    )
+
+    if (returnCode != 0) {
+        error("RocketChat notification failed!")
+    } else {
+        echo "RocketChat notification sent successfully"
+    }
+}

vars/rocketSend.txt

@@ -0,0 +1,37 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<p>
+    Part of <code>@Library('jenkins-pipeline-shared-libraries')</code>
+</p>
+<dl>
+    <dt>
+        <code id="rocketSend">rocketSend(webHook:String, message:String, channel:String=null, avatar:String=null, rawMessage:Boolean=true):void</code>
+    </dt>
+    <dd>
+        <p>
+            Publish message at chat.puzzle.ch
+            <br />
+            Example call:
+            <br>
+            <code>rocketSend("https://chat.puzzle.ch/hooks/../..", "Build Successful", "general", "https://chat.puzzle.ch/emoji-custom/success.png", true)</code>
+        </p>
+        <ul>
+            <li>
+                <b>webHook</b> - WebHook Url
+            </li>
+            <li>
+                <b>message</b> - Content of the Rocket Chat message
+            </li>
+            <li>
+                <b>channel</b> - Channel used in Rocket Chat
+            </li>
+            <li>
+                <b>avatar</b> - Avatar image used in Rocket Chat
+            </li>
+            <li>
+                <b>rawMessage</b> - Message should be sent as raw text
+            </li>
+        </ul>
+    </dd>
+</dl>
+<!-- vim: set ft=html : -->
+<!-- code: set language=html : -->