added commentary on default options

src/tracker/Tracker.java

@@ -44,7 +44,7 @@ public class Tracker {
 			Scanner scanner = new Scanner(System.in);
 			Tracker t;
 
-			System.out.println("Tracker Server, enter hostname to bind : ");
+			System.out.println("Tracker Server, enter hostname to bind (default = localhost): ");
 			String hostname = scanner.nextLine();
 			if(hostname.equals("")){
 				hostname = defaultHostname;
@@ -52,7 +52,7 @@ public class Tracker {
 			}	else{
 				System.out.println("using hostname : " + hostname);
 			}
-			System.out.println("enter port : ");
+			System.out.println("enter port (default = 6969): ");
 			String port = scanner.nextLine();
 			if(port.equals("")){
 				port = defaultPort;