Added critical point calculator

[Maana-Ajmera]

Description

Enter the value of Van der wall constants and get critical point of that ideal gas

Fixes: #2368

Type of change

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

Checklist:

• I have made this from my own
• I have taken help from some online resourses
• My code follows the style guidelines 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 made corresponding changes to the documentation
• My changes generate no new warnings

ATTACH SCREEN-SHOTS / DEPLOYMENT LINK

Screen.Recording.2024-07-13.at.8.42.42.PM.mov

[github-actions]

Thank you for submitting your pull request! 🙌 We'll review it as soon as possible. In the meantime, please ensure that your changes align with our CONTRIBUTING.md. If there are any specific instructions or feedback regarding your PR, we'll provide them here. Thanks again for your contribution! 😊

[Sulagna-Dutta-Roy]

Delete the .DS_Store files that you've added @Maana-Ajmera

[Maana-Ajmera]

@Sulagna-Dutta-Roy I dont have this file in my local repository , maybe there is some error , I am closing this and creating new PR for the same , sorry for the inconvinience