Creating a documentation for contribution guide

[abdeldjalilhachimi]

1. Contributors can use documentation as a guide to contribute.
2. Contributor can Understand the project's workflow via documentation.
3. Contributor can follow code guide based on what is written on documentation.
4. Contributor can follow style guide based on what is written on documentation.

[ZibanPirate]

closing this because we no longer host our own documentation, will re-open it once we bring back documentation, for now the main Readme should be enough to get started