Some Pull Requests tips for GCI students

Hi student participants, so glad about all your participation and contributions so-far :smile:

Just looked into several of your pull requests and had some thoughts come into my mind for you, please have a look at some tips on pull requests at:

Just for better reviews, when any of you GCI participants open up pull request(s) on github, please try to refer to the ticket referenced by using well names for the pull request, like: GCI-5 Add a .gitignore file to selected OpenMRS modules and at-least try to mention the url to the ticket in your descriptions