CONTRIBUTING TO DOCUMENTATION

If you are contributing to the documentation of the project, follow these guidelines:

## for directory
### for file
- If the file does not have any functions in it, describe what the file does.
#### for any function or usable variable in the file.
If the file contains a class, use #### for the class.
- Use ##### for any function in the class.

Keep a space between # and the heading text.
Leave a line after every heading.

Table of contents generator:

https://github.com/ekalinin/github-markdown-toc