docs: add minimal contribution guidlines PE-4186

Adds CONTRIBUTING.md outlining minimal set of contribution guidelines.
We can expand it as we gain experience and get feedback from the our dev
community.

CONTRIBUTING.md

@@ -0,0 +1,35 @@
+# Contributing Guidelines
+
+NOTE: Contribution implies licensing under the terms of [LICENSE]
+(AGPL-3).
+
+## Pull Request Checklist
+
+- Confirm the PR is against the `develop` branch.
+- Ensure commit messages follow the [conventional commits] style.
+- Ensure commit messages adequately explain the reasons for the changes.
+- Ensure changes are consistent with the [principles and practices]
+  outlined in the README.
+- [Run lint].
+- [Run the unit tests].
+
+## Writing Good Commit Messages
+
+- Keep the first line short but informative.
+- Provide explanation of why the change is being made in the commit message
+  body.
+- Prefer copying relevant information into the commit body over linking to them.
+- Consider whether your commit message includes enough detail for someone to be
+  able to understand it in the future.
+
+## Branching Workflow
+
+- New branches are created on `develop`.
+- When complete new branches are merged to `develop`.
+- At release time, `develop` is merged into `main`.
+
+[license](./LICENSE)
+[conventional commits](https://www.conventionalcommits.org/en/v1.0.0/)
+[principles and practices](https://github.com/ar-io/ar-io-node/tree/develop#principles-and-practices)
+[run tests](https://github.com/ar-io/ar-io-node/tree/develop#run-tests)
+[run lint](https://github.com/ar-io/ar-io-node/tree/develop#run-lint)

README.md

@@ -15,6 +15,10 @@
 
 `yarn db:migrate up`
 
+### Run lint
+
+`yarn lint:check`
+
 ### Run tests
 
 `yarn test`