[Improve] Update the main README.md, CONTRIBUTING.md and Scrapper-Service/README.md

[thesagarsehgal]

Some of the improvements that must be added to the main README.md file.

• In the Prerequisites section, for the various tools like Mongo DB, Angular, etc., please provide a link to the installation instructions for Windows and Linux systems.
• The /Scrapper-Service folder has requirements.txt file. Please add instructions for creating the virtual environment and installing the /Scrapper-Service/requirements.txt.
• For Deployment of Scrapper-Service section, in the instructions, change main.py to app.py.
• For Deployment section, separate all the commands into different blocks, instead of putting all of them in one block. Further, please remove the >> symbol in the beginning, because currently, it becomes difficult to copy the complete command in a double click.
• Also, similar work has to be done in the ATTENTION section of CONTRIBUTING.md file for separating all the commands into different blocks, instead of putting all of them in one block.
• Add instructions on how to run the Scraper Service in different modes in the /Scrapper-Service/README.md.

[maheshschand]

Interested. Could you please assign this to me @sagar-sehgal ?

[poojasrinivass]

I would like to work on this issue.

[ikoala21]

If it is not assigned yet, I would like to take this up.

[thesagarsehgal]

@maheshschand @poojasrinivass @manasakalaga Thank You for showing interest in the issue. I am assigning 1-1 mini task to each one of you. As soon as you solve one of the mini-task, I will assign a new mini-task to you.

@maheshschand :- In the Prerequisites section, for the various tools like Mongo DB, Angular, etc., please provide a link to the installation instructions for Windows and Linux systems.

@poojasrinivass :- The /Scrapper-Service folder has requirements.txt file. Please add instructions for creating the virtual environment and installing the /Scrapper-Service/requirements.txt .

@manasakalaga :- For Deployment of Scrapper-Service section, in the instructions, change main.py to app.py.