feat: Add comprehensive examples from multithreading and hashing lectures

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

@@ -0,0 +1,9 @@
+package lecture.multithreading.basics;
+
+
+public class MyThread extends Thread {
+    @Override
+    public void run() {
+        System.out.println("Thread is running: " + Thread.currentThread().getName());
+    }
+}