Add a laser linewidth and bandwidth calculator

[Akashoa]

Description

A Laser Linewidth and Bandwidth Calculator is used to calculate the linewidth and bandwidth of a laser, which are critical parameters in determining the performance and applications of a laser system such as in fibre optics

Screenshots

No response

Checklist

• I have checked the existing issues.
• I follow Contributing Guidelines of this project.
• I am a GSSOC'24 contributor.
• I am a IWOC'24 contributor.
• I am a JWOC'24 contributor.
• I am a SWOC'24 contributor.

Code of Conduct

• I agree to follow this project's "Code of Conduct".

[github-actions]

Hey @Akashoa, Welcome to the project CalcDiverse! 🎊
Thanks for opening an issue! 🙌 Please wait for the issue to be assigned. Happy Coding!! ✨