Code cleanup

[alexmi256]

• Adds a bunch of lint tools including:
  • black
  • autopep8
  • pre-commit
  • flake8
  • isort
  • autoflake
• Lints existing code
• Fixed issue with single image
• Added other configs and settings for better maintaining project
  • CONTRIBUTING.md
  • .gitignore for Python
  • requirements.txt and requirements-dev.txt

[GouravWadhwa]

Hi Alexmi, Sorry for replying so late. Please let me know if you have tested it locally once. Then I will approve the changes.