Task4: Removed show action and made some text changes.
Task4: Removed show view file.
Task-4: Added project description in README file and changed the title of Application.
Task-4: Made changes in README and index files. Also changes the databse name.
Task-4: Code Refactor

 - Added comments.
 - Changed database config file.
 - Added ruby version file.
 - Error message chnages.