src: Adding log4cxx logging

Refs: #1505

Change-Id: Ib154d91f81acf3f1dd8bbcf552062a16d03fec74
diff --git a/nlsr.conf b/nlsr.conf
index 2f2440f..b3eacb6 100644
--- a/nlsr.conf
+++ b/nlsr.conf
@@ -14,7 +14,9 @@
 
 ; log-level is to set the levels of log for NLSR
 
-    log-level  INFO            ; default value INFO, valid value DEBUG, INFO
+    log-level  INFO       ; default value INFO, valid value DEBUG, INFO
+    log-dir /var/log/nlsr/  ; path for log directory (Absolute path)
+    seq-dir /var/lib/nlsr/  ; path for sequence directory (Absolute path)
 }
 
 ; the neighbors section contains the configuration for router's neighbors and hello's behavior