Update README to Include MongoDB Setup Instructions and Endpoint Data Population

[aditya4196]

Description:
There are some key areas of improvement to streamline the onboarding process for new contributors in the README file:

1. Instructions on setting up MongoDB, either with a regular installation or with MongoDB Atlas.
2. Guidance on how to populate initial data into the MongoDB database using provided endpoints.

Tasks:

• MongoDB Setup Instructions:

  • Add a section under "Prerequisites" or "Getting Started" that guides contributors through the process of setting up MongoDB.
    • Provide instructions for a standard MongoDB setup.
    • Offer an alternative guide for those who wish to use MongoDB Atlas.
    • Ensure contributors understand how to connect their application instance to their MongoDB instance, particularly if using MongoDB Atlas.

• Data Population via Endpoints:

  • Detail the need for initial data population for the application to function as expected.
  • Provide instructions on how to hit the POST http://localhost:3001/habit/ endpoint (and any other relevant endpoints) to add initial data.
    • Consider adding information about using a tool like Postman.
    • Optionally, provide a JSON sample for what the POST request's body should look like.

Where to Add:
Consider adding the MongoDB setup instructions under a new sub-section in "Getting Started" named "Setting Up MongoDB". The data population instructions might best fit as an extension to the "Running Backend Node JS Application" section.

Notes:
It's crucial to ensure the README remains clear and not too cluttered. All additions should be concise, well-organized, and intuitive for new contributors. If necessary, link out to more detailed guides or documentation instead of overloading the README.

[lugenx]

Thank you for bringing up these @aditya4196, I have edited the issue to make it more descriptive and assigned it to you, please let me know if you have any questions when working on it.