add reddit wallpapers scraper

[valterm]

Description

Created scraper for wallpapers

Fixes #595

Type of change

Choosing one or more options from the following as per the nature of your Pull request.

• NOTE: These boxes can be checked using [X]

• [ ] Bug fix (non-breaking change which fixes an issue)

• [x] New feature (non-breaking change which adds functionality)

• [ ] Documentation Update

Checklist:

Please tick all the boxes that are fulfilled by your Pull Request.

• [x] I have named my files and folder, according to this project's guidelines.
• [x] My code follows the style guidelines of this project.
• [x] My Pull Request has a descriptive title. (not a vague title like Update index.md)
• [x] I have commented on my code, particularly in hard-to-understand areas.
• [x] I have created a helpful and easy to understand README.md, according to the given README_TEMPLATE.
• [x] I have included a requirements.txt file (if external libraries are required.)
• [x] My changes do not produce any warnings.
• [x] I have added a working sample/screenshot of the script.

[valterm]

Thank you @tusharnankani ! I'll be sharing more projects here 👍

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