Added SimpleFormatter
Added multiple Log related Exceptions
Added Loglevel object and use it everywhere necessary
Updated SimpleFileSink to throw exceptions when necessary
Initial commit of factory class and Configuration class, which is used to create the logger object
Added a ConsoleSink for logs
Added conventional functions to the Logger to log an error/warning/...
Added JUnit jar dependency
Add IDEA-Project to the repository
Add junit test for SimpleFormatterTest.java