Add suggestion to press ctrl-C in instructions

Consider adding the hint to 'press ctrl-C to stop the current process' to the following (existing) instruction:

Step 1: In the root folder of your project, issue the following command to rebuild the project:

mvn verify
Step 2: To run the CMS, site and Essentials WARs, issue the following command from the project root directory:

mvn -Pcargo.run -Drepo.path=storage