feat: Screenshot Gui added with documentation

[tanujbordikar]

Description

Under GSSOC'23

In this PR,

1. I have added the feature of screenshot will proper tkinter gui in python.
2. Added a time delay button to capture after that delay.
3. Also can take multiple screenshot from the tkinter gui.
4. Added the documentation for screenshot folder.

Screenshots:

• tkinter gui:
  
• actual screenshot taken by that:
  

Fixes #2541

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update
• Documentation Update

Checklist:

• My code follows the style guidelines(Clean Code) of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have created a helpful and easy to understand README.md
• My documentation follows Template for README.md
• I have added the project meta data in the PR template.
• I have created the requirements.txt file if needed.

Project Metadata

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Category:

• Calculators
• AI/ML
• Scrappers
• Social_Media
• PDF
• Image_Processing
• Video_Processing
• Games
• Networking
• OS_Utilities
• Automation
• Cryptography
• Computer_Vision
• Fun
• Others

Title: <write script title here>

Folder: Screenshot

Requirements: python - tkinter, pyautogui

Script: screenshot.py

Arguments: <enter any arguments that the script needs but - separeted like: h-c-m>

Contributor: tanujbordikar

Description: <Enter a one line description that describes your script. Also, explain the arguments usage here>