added draft contribution guidelines and code of conduct

CODE_OF_CONDUCT.md

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+# Intro.js 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]>. All
+complaints will be reviewed and investigated and will result in a response that
+is deemed necessary and 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.
+
+## 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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+# Contributing
+
+By participating in this project, you agree to abide by the [code of conduct].
+
+[code of conduct]: https://github.com/usablica/intro.js/blob/master/CODE_OF_CONDUCT.md
+
+## Best Practices
+
+Before you post any issue or pull request, search [the issues][issues] and [the pull requests][pulls] to see if it has already been addressed. 
+
+[issues]: https://github.com/usablica/intro.js/issues
+[pulls]: https://github.com/usablica/intro.js/pulls
+
+Here are some best practices that will help us accept/address pull requests and issues:
+
+* Outline one, **and only one**, specific problem/feature that you are trying to address.
+* Write a **good title** that summarizes the specific problem.
+* Introduce the problem before you write any code.
+* **Help us reproduce the problem** if applicable with a [jsfiddle][jsfiddle]/[codepen][codepen] showcasing the need for a solution.
+
+[jsfiddle]: https://jsfiddle.net/
+[codepen]: https://codepen.io/
+
+## Pull Requests
+
+Fork, then clone the repo:
+
+    git clone [email protected]:your-username/intro.js.git
+
+Make your changes and push to your fork and [submit a pull request][pr].
+
+[pr]: https://github.com/usablica/intro.js/compare
+
+At this point you're waiting on us. We may suggest some changes or improvements or alternatives.