Pull Request for "A Guide to Rolling File Appenders" article. (#876)

* First test with log4j rolling appenders

* small fix

* Log4j rolling appender

* First set up with rolling file on log4j 2

* Added logback code.

* log4j2 more detailed example

* log4j2 more detailed example

* Improved names and examples

* Fixed configurations

* improved configs

* formatted

* Final fix

* fixed formatting

* Formatting fix

* Fix sample apps to avoid try / catch

* Fix request to replace files

* Fix end lines

log4j/src/main/java/com/baeldung/slf4j/Slf4jRollingExample.java

@@ -0,0 +1,19 @@
+package com.baeldung.slf4j;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.util.stream.IntStream;
+
+public class Slf4jRollingExample {
+
+    private static Logger logger = LoggerFactory.getLogger(Slf4jRollingExample.class);
+
+    public static void main(String[] args) throws InterruptedException {
+        for(int i = 0; i<2000; i++){
+            logger.info("This is the {} time I say 'Hello World'.", i);
+            Thread.sleep(100);
+        }
+    }
+
+}