create tATCalc

[WaterCubeGod]

Issue Id you have worked upon -

Issue: #524

Briefly explain your program logic -

This program is a React component that serves as a Turnaround Time (TAT) calculator. Here's a concise explanation of what the code does:

1. It defines state variables to manage input and results.
2. Users can input the number of processes and their arrival/completion times.
3. When the "Calculate TAT" button is clicked, it sorts processes by arrival time and calculates TAT values.
4. The program handles invalid input (negative or non-numeric values).
5. It displays TAT values, total TAT, and average TAT.
6. If input is invalid or no processes are entered, it shows an appropriate error message.

Screenshots(Attach 2 screenshots of your own input and output) -

By raising this PR I affirm that -

• [x] My code follows the guidelines of this project.
  

• [x] I have performed a self-review of my own code.
  

• [x] I have commented my code.
  

• [x] My code gives the correct output.
  

• [x] I affirm that I strictly follow contributing guidelines and code of conduct.

[SarthakKeshari]

Congratulations 🎉 @WaterCubeGod on your contribution. Thanks for adding value to this repository. 😊

Let's celebrate this fest 😃 by providing more developers 👨‍💻👩‍💻 an opportunity to contribute. Help us make this repository reach far and more by sharing this to your friends and colleagues.

Your efforts can make difference.

[SarthakKeshari]

Hey 👋, may you also encourage us by clicking the star icon on the repository main page. ⭐