feat: Add comprehensive examples from multithreading and hashing lectures

src/main/java/lecture/multithreading/basics/SleepExample.java

@@ -0,0 +1,26 @@
+package lecture.multithreading.basics;
+
+
+public class SleepExample {
+    public static void main(String[] args) {
+        System.out.println("starting program");
+
+        try {
+            Thread.sleep(10000);
+        } catch (InterruptedException e) {
+            e.printStackTrace();
+        }
+
+        for (int i = 1; i <= 10; i++) {
+            System.out.println("Count: " + i);
+
+            try {
+                Thread.sleep(1000); // 1 second stop
+            } catch (InterruptedException e) {
+                System.out.println("Thread terminated!");
+            }
+        }
+
+        System.out.println("End of program");
+    }
+}