Add Simple Logger and Status Logger pages

[vy]

This PR addresses StatusLogger and SimpleLogger tasks of #2540.

[ppkarwasz]

I think we should remove the documentation of StatusLogger and SimpleLogger configuration properties from systemproperties.adoc: these are common properties that can be useful to both Log4 Core 2 and Log4j Core 3 users, but should appear only once.

[vy]

I think we should remove the documentation of StatusLogger and SimpleLogger configuration properties from systemproperties.adoc: these are common properties that can be useful to both Log4 Core 2 and Log4j Core 3 users, but should appear only once.

Implemented in 9a2815b.