Added debug levels. Code style

src/main/resources/settings.properties

@@ -2,10 +2,19 @@
 # NanoLimbo configuration
 #
 
+# Server's host address
 host=localhost
+
+# Server's port
 port=65535
+
+# Max amount of players can join to server
 max-players=100
+
+# Version string when client version is not compatible with server one
 ping-version=NanoLimbo
+
+# Server's description component
 ping-description={"text": "NanoLimbo"}
 
 # Player info forwarding support. Available types: NONE, LEGACY, MODERN
@@ -15,4 +24,13 @@ ip-forwarding=LEGACY
 ip-forwarding-secret=<YOUR_SECRET_HERE>
 
 # Read timeout for connections in milliseconds
-read-timeout=30000
+read-timeout=30000
+
+# Define debug level. On release, i recommend to use 1 level, since
+# there are many useless for release warnings about undefined packets and other.
+# Levels:
+# 0 - Display nothing
+# 1 - Display only useful info
+# 2 - Display info and warnings
+# 3 - Display info, warnings, errors
+debug-level=3