docs: add code of conduct & contributing

Author: gregberge

CODE_OF_CONDUCT.md

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+# Contributor Covenant Code of Conduct
+
+## Our Pledge
+
+In the interest of fostering an open and welcoming environment, we as contributors and maintainers pledge to making participation in our project and our community a harassment-free experience for everyone, regardless of age, body size, disability, ethnicity, gender identity and expression, level of experience, nationality, personal appearance, race, religion, or sexual identity and orientation.
+
+## Our Standards
+
+Examples of behavior that contributes to creating a positive environment include:
+
+- Using welcoming and inclusive language
+- Being respectful of differing viewpoints and experiences
+- Gracefully accepting constructive criticism
+- Focusing on what is best for the community
+- Showing empathy towards other community members
+
+Examples of unacceptable behavior by participants include:
+
+- The use of sexualized language or imagery and unwelcome sexual attention or advances
+- Trolling, insulting/derogatory comments, and personal or political attacks
+- Public or private harassment
+- Publishing others' private information, such as a physical or electronic address, without explicit permission
+- Other conduct which could reasonably be considered inappropriate in a professional setting
+
+## Our Responsibilities
+
+Project maintainers are responsible for clarifying the standards of acceptable behavior and are expected to take appropriate and fair corrective action in response to any instances of unacceptable behavior.
+
+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.
+
+## Scope
+
+This Code of Conduct applies both within project spaces and in public spaces when an individual is representing the project or its community. Examples of representing a project or community include using an official project e-mail address, posting via an official social media account, or acting as an appointed representative at an online or offline event. Representation of a project may be further defined and clarified by project maintainers.
+
+## Enforcement
+
+Instances of abusive, harassing, or otherwise unacceptable behavior may be reported by contacting the project team at [email protected]. The project team will review and investigate all complaints, and will respond in a way that it deems appropriate to the circumstances. The project team is obligated to maintain confidentiality with regard to the reporter of an incident. Further details of specific enforcement policies may be posted separately.
+
+Project maintainers who do not follow or enforce the Code of Conduct in good faith may face temporary or permanent repercussions as determined by other members of the project's leadership.
+
+## Attribution
+
+This Code of Conduct is adapted from the [Contributor Covenant][homepage], version 1.4, available at [http://contributor-covenant.org/version/1/4][version]
+
+[homepage]: http://contributor-covenant.org
+[version]: http://contributor-covenant.org/version/1/4/

CONTRIBUTING.md

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+# How to Contribute
+
+Smooth UI is a small project, it is widely used but has not a lot of contributors. We're still working out the kinks to make contributing to this project as easy and transparent as possible, but we're not quite there yet. Hopefully this document makes the process for contributing clear and answers some questions that you may have.
+
+## [Code of Conduct](https://github.com/smooth-code/smooth-ui/blob/master/CODE_OF_CONDUCT.md)
+
+We expect project participants to adhere to our Code of Conduct. Please read [the full text](https://github.com/smooth-code/smooth-ui/blob/master/CODE_OF_CONDUCT.md) so that you can understand what actions will and will not be tolerated.
+
+## Open Development
+
+All work on Smooth UI happens directly on [GitHub](/). Both core team members and external contributors send pull requests which go through the same review process.
+
+### Workflow and Pull Requests
+
+_Before_ submitting a pull request, please make sure the following is done…
+
+1.  Fork the repo and create your branch from `master`. A guide on how to fork a repository: https://help.github.com/articles/fork-a-repo/
+
+    Open terminal (e.g. Terminal, iTerm, Git Bash or Git Shell) and type:
+
+    ```sh-session
+    $ git clone https://github.com/<your_username>/smooth-ui
+    $ cd smooth-ui
+    $ git checkout -b my_branch
+    ```
+
+    Note: Replace `<your_username>` with your GitHub username
+
+2.  Smooth UI uses [Yarn](https://code.fb.com/web/yarn-a-new-package-manager-for-javascript/) for running development scripts. If you haven't already done so, please [install yarn](https://yarnpkg.com/en/docs/install).
+
+3.  Run `yarn install`. On Windows: To install [Yarn](https://yarnpkg.com/en/docs/install#windows-tab) on Windows you may need to download either node.js or Chocolatey<br />
+
+    ```sh
+    yarn install
+    ```
+
+    To check your version of Yarn and ensure it's installed you can type:
+
+    ```sh
+    yarn --version
+    ```
+
+4.  If you've added code that should be tested, add tests. You can use watch mode that continuously transforms changed files to make your life easier.
+
+    ```sh
+    # build packages continuously
+    yarn run build:watch
+    # run docs
+    yarn run dev
+    ```
+
+5.  If you've changed APIs, update the documentation.
+
+6.  Ensure the linting is good via `yarn lint`.
+
+    ```sh-session
+    $ yarn lint
+    ```
+
+7.  Ensure the test suite passes via `yarn test`.
+
+    ```sh-session
+    $ yarn test
+    ```
+
+## Bugs
+
+### Where to Find Known Issues
+
+We will be using GitHub Issues for our public bugs. We will keep a close eye on this and try to make it clear when we have an internal fix in progress. Before filing a new issue, try to make sure your problem doesn't already exist.
+
+### Reporting New Issues
+
+The best way to get your bug fixed is to provide a reduced test case. Please provide a public repository with a runnable example.
+
+## Code Conventions
+
+Please follow the `.prettierrc` in the project.
+
+## License
+
+By contributing to SVGR, you agree that your contributions will be licensed under its MIT license.