Remove unnecessary files and dependencies

[Devasy23]

Changes Made:

1. Removed __pycache__ folders: Cleaned up unnecessary cache files from the repository to keep it tidy.
2. Removed Python virtual environment: Deleted the virtual environment that was accidentally pushed into the repo by @revanth1718 in PR Streamlit App for Depression Support Issue no #99 #115 to avoid clutter and potential conflicts.
3. Added .gitignore file: Included a .gitignore file to prevent accidental commits of unnecessary files such as cache files, virtual environments, and other temporary files.
4. Applied black and isort formatting: Reformatted all Python and Jupyter Notebook files using black and isort to ensure code consistency and readability across the project.

These changes are part of my contribution to the GirlScript Summer of Code (GSSoC). Kindly assign this PR a level 2 and grant me the corresponding points.

Thank you!

[github-actions]

Welcome to Our repository.🎊 Thank you so much for taking the time to point this out.

[Devasy23]

I have completed my tasks for this pull request and it is ready for review and merging. Could you please assign the 'gssoc' tag and the appropriate level to it? I propose that it be classified as 'level 3'. Thank you.

@TAHIR0110