Add logging using Log4j2

SymphonyDatabaseNode/src/main/java/io/github/lumijiez/Main.java

@@ -1,13 +1,17 @@
 package io.github.lumijiez;
 
 import jakarta.persistence.EntityManager;
+import org.apache.logging.log4j.Logger;
+import org.apache.logging.log4j.LogManager;
 
 public class Main {
+    public static Logger logger = LogManager.getLogger(Main.class);
+
     public static void main(String[] args) {
-        System.out.println("Node up");
+        logger.info("Node up.");
         EntityManager em = Data.getEntityManager();
 
-        System.out.println("Connected to DB << symphony >>");
+        logger.info("Connected to database: << symphony >>");
         em.close();
     }
 }