v2.0 ready for Production

1. API
   Create Add, update, remove, get RESTful apis for the ToDo List application. Implement request validation using either custom logic or a library like joi. Display appropriate error messages.
2. Database Connectivity:
   Creating a list of tables for todolist application, and save the datas with the respective data types using Postgres SQL.
3. Reusability:
   Develop reusable methods. Aim for maximum reusability and maintainability of methods and functions throughout the application.
4. Testing:
   Write unit tests using Mocha - chai Testing Library for critical components and utility functions. Aim for good test coverage and ensure that all functions behave as expected.

Full Changelog: v1.0...v2.0