Add functionality for config command

[joshiayush]

Description

inb/inb/inbparser/command.py

Lines 338 to 355 in 2f66b3a

	def config(self: Command) -> None:
	"""Method `config()` stores user's information in database.
	This feature is not programed yet. Contributions are welcome.
	Args:
	self: (Command) Self.
	Example:
	>>> from argparse import Namespace
	>>> from inbparser import Command
	>>>
	>>> namespace = Namespace(which='config', EMAIL='ayush@gmail.com', PASSWORD='xxx-xxx-xxx')
	>>> command = Command(namespace)
	>>> command.config()
	>>> # -> It should update database with new values
	"""
	self.logger.info("facility not present")

As of now the config command which is meant to create or update entries in the database does not work. It will be a good feature to implement in conjunction with the delete command and before show command.

Possible solutions

1. Try to set up a database probably in inb/database, (use SQLite).
2. Check if we have write permissions or not if not then throw PERM error otherwise follow the below steps.
3. Check if database exists or not, if it does not then create the following table:

   CREATE TABLE database_name.inb_users(
       Email CHAR(50) PRIMARY KEY NOT NULL,
       Password CHAR(50) NOT NULL,
       CreatedAt DATETIME DEFAULT (STRFTIME('%Y-%m-%d %H:%M:%f', 'NOW')) 
   );

   Note: Database must be created at the top level directory inside of the db folder.
4. After the 2 step, insert the fields given by the user.

config command should follow the following command line arguments:

$ inb.py config --email "user_email" --password "user_password"