golang gorm app should CREATE DATABASE automatically

[schoudhury]

CREATE DATABASE gormdemo; is a mandatory step before the golang gorm code can be started. This should not be the case and this database should be auto-created every time the app is started (it can drop the previous database using DROP DATABASE)

[azeemshahzad]

To achieve uniform behavior across all apps, the database would be created manually. I have updated ReadMe with instruction to create database.