[ENHANCEMENT] Improve documentation for developers

**Describe the feature you'd like to have implemented**
I would like to see methods described in the code or documentation, and a primitive example of how to create virtual worlds.

**Is your feature request related to an existing problem? Please describe.**
Without documentation, you have to sit and research the LimboAuth plugin for a very long time to try to understand how to work with LimboAPI.
But in LimboAuth there is a lot of code and it is without comments, you have to sit with a debugger to understand something in it.

**Additional context**
All we have from the code samples are three lines from README.md