Add CONTRIBUTING.md File to Repo

[nelsonic]

As a person who is new to the DWYL Org/Community 🆕
I need to know how to contribute to the project effectively 💭
so that I can start my journey towards Doing What I Love with my Life! ❤️ ✅ 😂

Markdown:

_**Please read** our_
[**contribution guide**](https://github.com/dwyl/contributing)
(_thank you_!)

Note: these are line-separated but in the actual rendered page it's all one line.
see: https://github.com/dwyl/contributing/blob/master/CONTRIBUTING.md