feat: add Lab4

Lab1/Lab1.java

@@ -0,0 +1,26 @@
+import java.util.Scanner;
+
+/**
+ * The main class for CS2030S Lab 1.
+ *
+ * @author Yadunand Prem
+ * @version CS2030S AY22/23 Semester 2
+ */
+class Lab1 {
+  public static void main(String[] args) {
+
+    // Create a scanner to read from standard input.
+    Scanner sc = new Scanner(System.in);
+
+    // Create a simulation. The ShopSimulation
+    // constructor will read the simulation parameters
+    // and initial events using the scanner.
+    Simulation simulation = new ShopSimulation(sc);
+
+    // Create a new simulator and run the simulation
+    new Simulator(simulation).run();
+
+    // Clean up the scanner.
+    sc.close();
+  }
+}