[GSSOC'23] Adding detailed readme to the salary predictor

[mkswagger]

Title: Add README with Screenshots and Output for Salary Predictor

Description: The current repository lacks a detailed README explaining the usage and features of the salary predictor. Create a comprehensive README.md file that includes clear installation instructions, usage examples, and screenshots showcasing the application's output. This will help users understand and utilize the salary predictor effectively.

Additional Information: Need to include relevant screenshots of the application's output and provide clear instructions on how to reproduce the results.

https://github.com/avinashkranjan/Amazing-Python-Scripts/blob/master/Salary%20Predictor/README.md

[mkswagger]

Hi @avinashkranjan ,
I am a contributor in GSSOC'23 , I would love to work on this issue. Please assign this issue to me

[avinashkranjan]

Go Ahead @mkswagger