Update readme.md (#121)

* Update readme.md

added real case example of how to use this plugin with Jenkins' Pipelines

readme.md

@@ -41,19 +41,52 @@ current build manually in the Pipeline script.
 ```groovy
 node {
     step([$class: 'StashNotifier'])         // Notifies the Stash Instance of an INPROGRESS build
-    
+
     try {
         // Do stuff
-    
+
         currentBuild.result = 'SUCCESS'     // Set result of currentBuild !Important!
     } catch(err) {
         currentBuild.result = 'FAILED'      // Set result of currentBuild !Important!
     }
-    
+
     step([$class: 'StashNotifier'])         // Notifies the Stash Instance of the build result
 }
 ```
 
+In situations where an advanced setup is required the following can be used:
+```groovy
+node {
+    this.notifyStash('INPROGRESS')         // Notifies the Stash Instance of an INPROGRESS build
+    
+    try {
+        // Do stuff
+    
+        this.notifyStash('SUCCESS')
+    } catch(err) {
+        this.notifyStash('FAILED')
+    }
+}
+
+def notifyStash(String state) {
+
+    if('SUCCESS' == state || 'FAILED' == state) {
+        currentBuild.result = state         // Set result of currentBuild !Important!
+    }
+
+    step([$class: 'StashNotifier',
+          commitSha1: "$commit",            // jenkins parameter that resolves to commit's hash
+          credentialsId: '00000000-1111-2222-3333-123456789abc',
+          disableInprogressNotification: false,
+          ignoreUnverifiedSSLPeer: true,
+          includeBuildNumberInKey: false,
+          prependParentProjectKey: false,
+          projectKey: '',
+          stashServerBaseUrl: 'https://stash.company.com'])
+
+}
+```
+
 ### Note on credentials
 
 Currently Stash Build Notifier Plugin accepts only raw plaintext credentials as it work over HTTP REST API of stash