Add content to contributing guidelines

CONTRIBUTING.md

@@ -1,9 +1,49 @@
 # Contributions
 
-Feel free to create pull requests for the following:
+Thanks for taking the time to understand how contributions work for the Chowist project.
+
+There are three general roles for contributing:
+
+- As a submitter
+- As a reviewer
+- As a contributor
+
+Look below for guidelines on each type of role.
+
+## Submitters
+
+Feel free to create pull requests for the following changes:
 
 - Enhancements to Django application logic
-- Additional media content (JPG, SVG, etc.)
-- Additional restaurants for restaurant fixture
+- Enhancements to Django templates
+- Enhancements to documentation
+- Additions to static files (JPG, SVG, etc.)
+- Additions to restaurant fixture
+
+Before submitting a pull request, follow the steps below to ensure that the review process goes smoothly.
+
+### Check Python formatting
+
+Run `black chowist places portal` to cleanup most formatting inconsistencies.
+
+Run `flake8` to look for remaining code to fix manually.
+
+### Check HTML formatting
+
+Verify that HTML uses two-space indents.
+
+Verify that CSS follow the `kebab-case` convention.
+
+### Check application correctness
+
+Run `python manage.py test` to verify core logic.
+
+Run `python manage.py runserver` and click through pages to verify workflows.
+
+## Reviewers
+
+Follow the repository's code of conduct while reviewing pull requests.
+
+## Contributors
 
-As you review pull requests, please follow the repository's code of conduct.
+Create a pull request indicating interest in becoming a project contributor.