Create development wiki pages

Instead of few lines in the README file, we should make use of [project wiki](https://github.com/kaizendorks/pymongo_inmemory/wiki) for all information necessary to contribute the project.

### Acceptance Criteria
* The first page for development wiki is created in https://github.com/kaizendorks/pymongo_inmemory/wiki
* Development section in README file is edited out and replaced with a link to the wiki.

Start with the development section in README and the project wiki linked in the issue. Create the first development wiki page with the contribution information currently in the README, then replace that README section with a link to the wiki. Done means the wiki page exists and the README points contributors to it.

Written by the indexing model from the issue text.