Created fcfs.c

[NivedhTJ]

Added First-Come, First-Served (FCFS) scheduling algorithm implementation

Description of Change

This adds a non-preemptive CPU scheduling algorithm implementation in C.
The algorithm queues processes in the order that they arrive in the ready queue.
The code calculates completion time, turnaround time, and waiting time for each process.

References

• https://en.wikipedia.org/wiki/Scheduling_(computing)
• Previous closed PR: a27f043

Checklist

• [x ] Added description of change
• [ x] Added file name matches File name guidelines
• [x ] Added tests and example, test must pass
• [x ] Relevant documentation/comments is changed or added
• [ x] PR title follows semantic commit guidelines
• [ x] Search previous suggestions before making a new one, as yours may be a duplicate.
• [ x] I acknowledge that all my contributions will be made under the project's license.

Notes: Adds FCFS scheduling algorithm in C with test cases.

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