Add code of conduct

CODE_OF_CONDUCT.md

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+## Community Code of Conduct
+
+### 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 the GraphQL Go community 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.
+
+## Scope 
+
+This code of conduct applies both within project spaces and in public spaces when an individual is representing the project or its community.
+
+## Our Standards
+
+Examples of behavior that contributes to a positive environment include:
+
+* Demonstrating empathy and kindness toward other people
+* Being respectful of differing opinions, viewpoints, and experiences
+* Giving and gracefully accepting constructive feedback
+* Accepting responsibility and apologizing to those affected by our mistakes,
+  and learning from the experience
+* Focusing on what is best not just for us as individuals, but for the
+  overall community
+
+Examples of unacceptable behavior include:
+
+* The use of sexualized language or imagery, and sexual attention or
+  advances of any kind
+* Trolling, insulting or derogatory comments, and personal or political attacks
+* Public or private harassment
+* Publishing others' private information, such as a physical or email
+  address, without their explicit permission
+* Other conduct which could reasonably be considered inappropriate in a
+  professional setting
+
+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. 
+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.
+
+## Reporting 
+
+For incidents occurring in the Graph Gophers community, contact @pavelnikolov in [the Gophers Slack](https://gophers.slack.com/) or alternatively you can contact  me [at] pavelnikolov [dot] net. You can expect a response within few business days.
+
+## Enforcement 
+
+The Graph Gophers maintainers enforce code of conduct issues for the graphql-go project as well other projects under the graph-gophers github organization.
+
+We try to resolve incidents without punishment, but may remove people from the project at our discretion.
+
+## Acknowledgements
+
+This Code of Conduct is adapted from the Contributor Covenant
+(http://contributor-covenant.org), version 2.0 available at
+http://contributor-covenant.org/version/2/0/code_of_conduct/