add support for mongodb and mongoose

[hezronkimutai]

What does this PR do?

This PR adds support for Mongo DB

Description of Task to be completed?

• Added a script that will be used to generate user controllers
• Added a script that will be used to generate user model
• Added a script that will be used to generate MongoDB set up

  How should this be manually tested?

• fetch the latest changes
• checkout to branch add-MongoDB-support
• npm start init
• Ensure you select mongoDB as your database and mongoose as your orm
• observe the generated app and you will see that MongoDB is set up

  Any background context you want to provide?

  The impelmentation of this task was based on this post

  Screenshots (if appropriate)

  

[hezronkimutai]

Hi @its-tayo and @ezkemboi , I have implemented the feedback I got. I created a helper function that handles 500 errors, I also modified the routes such that it the error handler is passed as middleware.

[ezkemboi]

Awesome @hezronkimutai, I will re-check and test this. At the moment, consider resolving/rebase the merge conflicts. Thanks.