Implemented Solution for 1st exercise

src/pp.01.01-Inheritance/src/main/java/pp/Sensor.java

@@ -37,5 +37,6 @@ public class Sensor extends Thread {
 
     public static void main(String... args) {
         var s = new Sensor(1000);
+        s.start();
     }
 }

src/pp.01.01-Inheritance/src/main/java/pp/Thermometer.java

@@ -18,6 +18,8 @@ public class Thermometer extends Sensor {
 
     public static void main(String... args) {
         var s1 = new Thermometer(1000);
+        s1.start();
         var s2 = new Thermometer(3000);
+        s2.start();
     }
 }