docs: add contributing guidelines

Signed-off-by: Chris Gianelloni <wolf31o2@blinklabs.io>

CONTRIBUTING.md

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+# Welcome to the Blink Labs contributing guide <!-- omit in toc -->
+
+Thank you for investing your time in contributing to our project!
+
+Read our [Code of Conduct](./CODE_OF_CONDUCT.md) to keep our community
+approachable and respectable.
+
+In this guide you will get an overview of the contribution workflow from
+opening an issue, creating a PR, reviewing, and merging the PR.
+
+## Getting started
+
+To get an overview of the project, read the [README](README.md). Here are some
+resources to help you get started with open source contributions:
+
+- [Conventional Commits](https://www.conventionalcommits.org/en/v1.0.0/)
+
+Blink Labs repositories use Conventional Commits for all commits. This defines
+a standard format for commit messages across repositories and projects.
+
+- [CODEOWNERS](CODEOWNERS)
+
+Blink Labs repositories use CODEOWNERS files to provide information on who
+should review a contribution. For repositories with regular outside
+contributors, they will be listed within this file in the repository or
+repositories which they maintain.
+
+<br>
+
+Contributions to open source come in many forms. You can contribute to Blink
+Labs projects in several ways.
+
+### Issues
+
+#### Create a new issue
+
+If you spot a problem with a project, search if an issue already exists. If a
+related issue doesn't exist, you can open a new issue in the repository.
+
+#### Solve an issue
+
+Scan through our existing issues to find one that interests you. You can narrow
+down the search using `labels` as filters. As a general rule, we don’t assign
+issues to anyone. If you find an issue to work on, you are welcome to open a PR
+with a fix.
+
+### Pull Request
+
+When you're finished with the changes, create a pull request, also known as a
+PR.
+- Don't forget to
+[link PR to issue](https://docs.github.com/en/issues/tracking-your-work-with-issues/linking-a-pull-request-to-an-issue)
+if you are solving one.
+- Enable the checkbox to
+[allow maintainer edits](https://docs.github.com/en/github/collaborating-with-issues-and-pull-requests/allowing-changes-to-a-pull-request-branch-created-from-a-fork)
+so the branch can be updated for a merge.
+Once you submit your PR, a Docs team member will review your proposal. We may
+ask questions or request additional information.
+- We may ask for changes to be made before a PR can be merged, either using
+[suggested changes](https://docs.github.com/en/github/collaborating-with-issues-and-pull-requests/incorporating-feedback-in-your-pull-request)
+or pull request comments. You can apply suggested changes directly through the
+UI. You can make any other changes in your fork, then commit them to your
+branch.