Add fcfs scheduling (#3335)

Co-authored-by: Smiti <smmaheshwari@paypal.com>

src/main/java/com/thealgorithms/scheduling/FCFSScheduling.java

@@ -0,0 +1,47 @@
+package com.thealgorithms.scheduling;
+
+import com.thealgorithms.devutils.entities.ProcessDetails;
+
+import java.util.List;
+
+/**
+ * Non-pre-emptive First Come First Serve scheduling. This can be understood here - https://www.scaler.com/topics/first-come-first-serve/
+ */
+public class FCFSScheduling {
+
+    private List<ProcessDetails> processes;
+
+    FCFSScheduling(final List<ProcessDetails> processes) {
+        this.processes = processes;
+    }
+
+    public void scheduleProcesses() {
+        evaluateWaitingTime();
+        evaluateTurnAroundTime();
+    }
+
+    private void evaluateWaitingTime() {
+        int processesNumber = processes.size();
+
+        if(processesNumber == 0) {
+            return;
+        }
+
+        int waitingTime = 0;
+        int burstTime = processes.get(0).getBurstTime();
+
+        processes.get(0).setWaitingTime(waitingTime); // for the first process, waiting time will be 0.
+
+        for(int i=1; i<processesNumber; i++) {
+           processes.get(i).setWaitingTime(waitingTime + burstTime);
+           waitingTime = processes.get(i).getWaitingTime();
+           burstTime = processes.get(i).getBurstTime();
+        }
+    }
+
+    private void evaluateTurnAroundTime() {
+        for(int i=0; i<processes.size(); i++) {
+            processes.get(i).setTurnAroundTimeTime(processes.get(i).getBurstTime() + processes.get(i).getWaitingTime());
+        }
+    }
+}