Create contributing doc

[hackygolucky]

We want members of the community to be encouraged to help add to knode. In order to do this, we need to lay a clear path as to how to contribute and what we need help with:

1. contribute.md
2. roadmap/list of issues that willing participants will take on. Bonus points if we can label by level of difficulty so newer programmers can help too.

[meandavejustice]

👍 for labeling difficulty!