Update README.md

README.md

 # Moodle Dockerized Code Testing (MoDoCoT) - Backend
 
 ## Usage
+An available Jenkins needs to run on the server where the backend container runs.
+The Jenkins has to listen on port 8080.
+If need to use another port for Jenkins have a look at Server application configuration / Local application configuration
+
 ### Conventions
 - The JUnit test classes cannot be organized in packages. Tasks and helper classes can use packages.
 
@@ -17,6 +21,7 @@ The file can be found under _/src/main/resources/_
 You need to configure following entries:  
 docker.hostIp= "Your docker host ip"
 jenkins.api.token= "Your jenkins api token" [See Jenkins Doc](https://www.jenkins.io/doc/book/using/remote-access-api/)
+(jenkins.url=http://${docker.hostIp}:"Your Jenkins Port"/) Use this property if your Jenkins listens on a port other than 8080
 
 ### Local application configuration
 We're using the **application.properties** file to configure the application.
@@ -25,6 +30,7 @@ The file can be found under _/src/main/resources/_
 You need to configure following entries:  
 docker.hostIp= "Your docker host ip"
 jenkins.api.token= "Your jenkins api token" [See Jenkins Doc](https://www.jenkins.io/doc/book/using/remote-access-api/)
+(jenkins.url=http://${docker.hostIp}:"Your Jenkins Port"/) Use this property if your Jenkins listens on a port other than 8080
 
 ## Interfaces
 ##### POST /v1/unittest