Contributing Guidelines for Blockstack/designs

[estermer]

#395

There was already a contributing guideline here, but I added content to the existing markdown with how to track issues, contribute code, and creating pr's.

This is generally designed after the recently created contributing guidelines here. Which are in turn a refactored version of bootstraps contributing guidelines.

[estermer]

@guylepage3 this is also reviewed for flow and updated based on some updates made in the PR from the .org repo here

[guylepage3]

awesome @estermer want to move that PR into the "For Review" column in the "Project?"
https://github.com/blockstack/designs/projects/1

[estermer]

@guylepage3 I dont believe I have the credentials to move things on the project boards.

[claassistantio]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.
_{You have signed the CLA already but the status is still pending? Let us recheck it.}