Fixes #3268: Created a README file for the Hello World plugin repo
Merge pull request #3 from Kegeruneku/bug_3268/dev/3268_readme_for_the_helloworld_plugin

Fixes #3268: Created a README file for the Hello World plugin repo
Merge branch 'branches/rudder/2.3' into branches/rudder/2.4
Merge branch 'branches/rudder/2.4' into branches/rudder/2.5