Minor Improvements to js syntax in `web` folder

Fix typo in contributing guide

added a dockerfile

Add a PowerShell script to download the models on Windows

Typo fix

Fix minor typos in prompts

Update README.md

Add `CITATION.cff` file to make it easy to cite JARVIS

added contribution file #issue24

Fixed Grammatical mistakes for better Readability.

This commit adds a CITATION.cff file to make it easy to cite JARVIS in different styles and formats, such as APA and BibTeX.

See for more info: https://docs.github.com/en/repositories/managing-your-repositorys-settings-and-features/customizing-your-repository/about-citation-files

optimised a block of code

Add missing models

Added missing models to dowload.sh.