add Validator

Change-Id: Ib8ce9023aad0782f934e8e6e559840b559d68208
diff --git a/log4cxx.properties.sample.in b/log4cxx.properties.sample.in
new file mode 100644
index 0000000..15a36d7
--- /dev/null
+++ b/log4cxx.properties.sample.in
@@ -0,0 +1,9 @@
+log4j.rootLogger=TRACE, A1
+log4j.appender.A1=org.apache.log4j.ConsoleAppender
+log4j.appender.A1.layout=org.apache.log4j.PatternLayout
+
+# Print the date in ISO 8601 format
+log4j.appender.A1.layout.ConversionPattern=%-5p %-15c - %m%n
+
+# Print only messages of level WARN or above in the package com.foo.
+#log4j.logger.com.foo=WARN
\ No newline at end of file