BAEL-8287 (#5180)

* Update README.md

* Update README.md

* Update README.md

* Update README.md

* Update README.md

* Create README.md

* Update README.md

* Update README.md

* Update README.md

* Update README.md

* Update README.md

* Update README.md

* Update README.md

* Update README.md

* Update README.md

* Update README.md

* Update README.md

* Update README.md

* Update README.md

* Update README.md

* Update README.md

* Update README.md

* Update README.md

* Update README.md

* Update README.md

* Update README.md

* Update README.md

* Update README.md

* Update README.MD

* Update README.md

* Update README.md

* Update README.md

* Update README.md

* Create README.md

* Update README.md

* Update README.md

* Create README.md

* Update README.md

* Update README.md

* Update README.md

* Update README.md

* Update README.md

* Update README.md

* Update README.md

* Update README.md

logging-modules/log4j/README.md

@@ -4,3 +4,4 @@
 - [Generate equals() and hashCode() with Eclipse](http://www.baeldung.com/java-eclipse-equals-and-hashcode)
 - [Introduction to SLF4J](http://www.baeldung.com/slf4j-with-log4j2-logback)
 - [A Guide to Rolling File Appenders](http://www.baeldung.com/java-logging-rolling-file-appenders)
+- [Logging Exceptions Using SLF4J](https://www.baeldung.com/slf4j-log-exceptions)

logging-modules/log4j2/README.md

@@ -3,3 +3,4 @@
 - [Intro to Log4j2 – Appenders, Layouts and Filters](http://www.baeldung.com/log4j2-appenders-layouts-filters)
 - [Log4j 2 and Lambda Expressions](http://www.baeldung.com/log4j-2-lazy-logging)
 - [Programmatic Configuration with Log4j 2](http://www.baeldung.com/log4j2-programmatic-config)
+- [Creating a Custom Log4j2 Appender](https://www.baeldung.com/log4j2-custom-appender)