Fix issue #34 : Easy/documented way to populate/input data to the DB + refactoring db_scripts code

As a solution to the issue made by @bruno-wp , I added a step-by-step basic instructions on how to input data into our DB, I also refactored the code in db_script ,so that we don't repeat same code in all files . instructions can be found in seeding_data.md file in root directory.