Add code of conduct and contributing guidelines

CODE_OF_CONDUCT.md

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+# Contributor Code of Conduct
+
+As contributors and maintainers of this project, and in the interest of
+fostering an open and welcoming community, we pledge to respect all
+people who contribute through reporting issues, posting feature
+requests, updating documentation, submitting pull requests or patches,
+and other activities.
+
+We are committed to making participation in this project a
+harassment-free experience for everyone, regardless of level of
+experience, gender, gender identity and expression, sexual orientation,
+disability, personal appearance, body size, race, ethnicity, age,
+religion, or nationality.
+
+Examples of unacceptable behavior by participants include:
+
+* The use of sexualized language or imagery
+* Personal attacks
+* Trolling or insulting/derogatory comments
+* Public or private harassment
+* Publishing other's private information, such as physical or electronic
+addresses, without explicit permission
+* Other unethical or unprofessional conduct
+
+Project maintainers have the right and responsibility to remove, edit,
+or reject comments, commits, code, wiki edits, issues, and other
+contributions that are not aligned to this Code of Conduct, or to ban
+temporarily or permanently any contributor for other behaviors that they
+deem inappropriate, threatening, offensive, or harmful.
+
+By adopting this Code of Conduct, project maintainers commit themselves
+to fairly and consistently applying these principles to every aspect of
+managing this project. Project maintainers who do not follow or enforce
+the Code of Conduct may be permanently removed from the project team.
+
+This Code of Conduct applies both within project spaces and in public
+spaces when an individual is representing the project or its community.
+
+Instances of abusive, harassing, or otherwise unacceptable behavior may
+be reported by contacting a project maintainer at <opensource@shopify.com>.
+All complaints will be reviewed and investigated and will result in a response
+that is deemed necessary and appropriate to the circumstances. Maintainers are
+obligated to maintain confidentiality with regard to the reporter of an incident.
+
+This Code of Conduct is adapted from the Contributor Covenant, version
+1.3.0, available from http://contributor-covenant.org/version/1/3/0/

CONTRIBUTING.md

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+# Contributing
+
+We welcome your contributions to the project. There are a few steps to take when looking to make a contribution.
+
+- Open an issue to discuss the feature/bug
+- If feature/bug is deemed valid then fork repo.
+- Implement patch to resolve issue.
+- Include tests to prevent regressions and validate the patch.
+- Update the docs for any API changes.
+- Submit a pull request.
+
+# Bug Reporting
+
+Shopify Admin API Library for Node uses GitHub issue tracking to manage bugs, please open an issue there.
+
+# Feature Request
+
+You can open a new issue on the GitHub issues and describe the feature you would like to see.
+
+# Developing the library
+
+Requirements:
+
+- [Node](https://nodejs.org/en/) v14 or above
+- [Yarn](https://yarnpkg.com/) v1.22 or above
+
+You can set up your development environment by running the following:
+
+```
+git clone git@github.com:Shopify/shopify-node-api.git # get the code
+cd shopify-node-api                                   # change into the source directory
+yarn install                                          # install dependencies
+yarn build                                            # build library
+```
+
+Helpful commands
+
+- `yarn lint` will run linting to make sure your code is of high standard
+- `yarn test` will run testing to ensure your code is covered by test cases