Write a wiki page for the config file

[L3nn0x]

We use a json file to configure the servers (and/or command line options). The goal would be to write a github wiki page to document every option in the config file to indicate the following:

• what does it do
• what are the possible values
• how could one adapt it to host its own server

The config file is described here: https://github.com/dev-osrose/osIROSE-new/blob/trunk/src/core/include/config.h
You'll have to search a bit in the codebase to understand how it is used. Because it's a singleton, every usage will have Core::Config::getInstance() somewhere before, to get the data.

[rminderhoud]

Added a basic page: https://github.com/dev-osrose/osIROSE-new/wiki/Config with some basic info. Missing things like "possible values" and "how could one adapt it to host its own server" but I think this can be easily improved by adding some more info.