More updates on the readme and packages.json file

[ezkemboi]

• There are some grammatical issues that need to be checked and rectified.
• Also, tell the user how to edit the database (const sequelize = new Sequelize('postgres://user:pass@example.com:5432/dbname'). Although it seems descriptive, there is need to add such description in Readme. Also, you can show the user how to make use of .env for such cases.
• In packages.json, there are 2 and 3 instances that nodejs and kemboijs occurs in the keywords section. We only need one instance of each.
• Also, add how to contribute to Readme file section.
• Any updates on the Readme, which is helpful to the user is also appreciated.

[Nicanor008]

Let me work on this issue

[ezkemboi]

Assigned you the task @Nicanor008.